Tutor MathsGuru: Ask me for your burning Maths questions!
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Vanilla Cake:
Hi CJM,
P = 96-Wksi:
[quote=\"CJM\"]Hi all,
need ur help on this question : -
Mr Lim sold a total of 96 papayas and watermelons for $560.
He sold each papaya for $3 and each watermelon for $7.
How many watermelons did Mr Lim sell ?
3(96-W) + 7W = 560
4W = 560-288 = 272
W = 68
Mr Lim sold 68 watermelons.
You may wish to refer to this http://p4mathsquestions.blogspot.com/2009/08/maths-decimals-solutions_21.html and apply the same concept to solve your question.
Selling price of 96 payayas -> 96x$3 = $288
Total amount of money collected for selling 96 papayas and watermelons = $560
Difference (total)= $(560-288) = $272
Difference (1 watermelon and 1 payaya) = $(7-3) = $4
1 payaya + $4 -> 1 watermelon
$272÷4= 68 (This step is enough and follow by the answer statement)
68 payayas + $272 -> 68 watermelons (Additional step to aid your understanding and is not necessary in actual workings.)
96-68 = 28 payayas (Additional step if the question asks for the number of payayas sold.)
Number of watermelons sold by Mr Lim = 68.
Check
Amount collected for selling 68 watermelons @ $7/each -> 68x$7=$476
Amount collected for selling 28 payayas @ $3/each -> 28x$3 = $84
Total amount collected -> $(476+84) = $560
I think this should be a P4 question and there are more examples over http://p4mathsquestions.blogspot.com/.Good luck.
Thanks
PS : Sorry for the above long-winded explanation.
VC's mum[/quote]thank u all for the explanations.
VC's mum : thanks for introducing the P4 blog : ) -
I need help for this question:
1. Ben has 20 more marbles than David. How many marbles must Ben give to David so that Ben will have 4 more marbles than David ?mathsguru:
Original Title: Let MathsGuru Answer Your Burning Maths Questions!
:welcome:
Dear Parents,
Are you frustrated/stuck when helping your child solve his/her Maths questions? Are you inclined to use Algebra most of the time? Do you have difficulty trying to use diagrams or other heuristic methods (that Primary School students learn) to solve?
:idea: Post your questions here and see how MathsGuru solve them to the best of her ability. Detailed solutions will be posted back in this thread.
So start asking and watch this space!!
Cheers :celebrate: ,
MathsGuru
P/S (Disclaimer, in case you're wondering...):
Although MathsGuru is a full-time Maths tutor, this thread is meant to be an absolutely free resource for parents (or even children) with no strings attached. Just someone who's passionate about Maths and wanna spread the fun in learning Maths with others.
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Ngserene617:
For every 1 marble that Ben gives David, Ben will have 2 less marbles compared to David.I need help for this question:
1. Ben has 20 more marbles than David. How many marbles must Ben give to David so that Ben will have 4 more marbles than David ?mathsguru:
Original Title: Let MathsGuru Answer Your Burning Maths Questions!
:welcome:
Dear Parents,
Are you frustrated/stuck when helping your child solve his/her Maths questions? Are you inclined to use Algebra most of the time? Do you have difficulty trying to use diagrams or other heuristic methods (that Primary
School students learn) to solve?
:idea: Post your questions here and see how MathsGuru solve them to the best of her ability. Detailed solutions will be posted back in this thread.
So start asking and watch this space!!
Cheers :celebrate: ,
MathsGuru
P/S (Disclaimer, in case you're wondering...):
Although MathsGuru is a full-time Maths tutor, this thread is meant to be
an absolutely free resource for parents (or even children) with no strings attached. Just someone who's passionate about Maths and wanna spread the fun in learning Maths with others.
So, when the diff in marbles reduces from 20 to 4 between Ben & David, Ben must have given David (20 - 4)/2 = 8 marbles -
Dharma:
Ngserene617:
I need help for this question:
1. Ben has 20 more marbles than David. How many marbles must Ben give to David so that Ben will have 4 more marbles than David ?
[quote=\"mathsguru\"]Original Title: Let MathsGuru Answer Your Burning Maths Questions!
:welcome:
Dear Parents,
Are you frustrated/stuck when helping your child solve his/her Maths questions? Are you inclined to use Algebra most of the time? Do you have difficulty trying to use diagrams or other heuristic methods (that Primary
School students learn) to solve?
:idea: Post your questions here and see how MathsGuru solve them to the best of her ability. Detailed solutions will be posted back in this thread.
So start asking and watch this space!!
Cheers :celebrate: ,
MathsGuru
P/S (Disclaimer, in case you're wondering...):
Although MathsGuru is a full-time Maths tutor, this thread is meant to be
an absolutely free resource for parents (or even children) with no strings attached. Just someone who's passionate about Maths and wanna spread the fun in learning Maths with others.
For every 1 marble that Ben gives David, Ben will have 2 less marbles compared to David.
So, when the diff in marbles reduces from 20 to 4 between Ben & David, Ben must have given David (20 - 4)/2 = 8 marbles[/quote]
Thank you, MathsGuru ! -
Hi, I need help with this question. No answer given.
A group of people went hunting. On average, 6 people hunted 5 rabbits, 15 people hunted 2 deer and 10 people hunted 1 buffalo. The total number of animals hunted was 6 more than the total number of people who went hunting. How many people went hunting?
Thank you. -
Hi mathguru or hi all
I am poor in math, can somebody help me to answer
Maha Bohdhi SA2 Paper 1 (2010)
Question 25, For every $2 that I get …
Question 26, The figure above of 4 idential cirlces…
Questions 27, During a science experiment…
Questions 28, ABC and PQR…
Question 29, In the diagram…
Question 30, After 40% of the boys…
I try to do the math, but i got it wrong. Need??? -
Maha Bohi SA2 math 2010, Paper 2
Many thanks for working out most of the solutions. I hv problem understanding but still trying to work out.
Pls help to answer the following :-
Question 7 - In the diagram show above, O is the centre of the circle and OAB is a right angle triange. Given that AB is 10cm and the shaded parts of the circle add up to 133 m square. Find the area of the circle.
Questions 10. Joanne and Tomomi bought the same bag from the same shop when they went shopping together . Johanne spents 75% of her money on the bag and Tomomi spent 2/3 of hers. What percentage of their total sum of money was the cost of a bag if the girls had $100 left altogether? (round off your answer to the nearest tenth).
Questions 12. Talik was given some pocket for recess, He realised that if he had spent $0.80 on each meal, he would have 8 meals fewer than if he had spent $0.60 on 8 meals and spent $0.80 on the remaining meals . How many meals did the money last him?
Q14. The diagram above, not drawn to scale, shows the dimensions of wheels of Kens bicycle. he pushed his bicycle down a slope 3m long. How many complete revolutions did the wheel make?
(sorry cant diagram) -
Ler:
Quick one as I need to go to school,my mum will continue for the rest of your problem sums.Maha Bohi SA2 math 2010, Paper 2
Many thanks for working out most of the solutions. I hv problem understanding but still trying to work out.Ler:
Pls post the diagram otherwise how can others be expected to solve without reading the diagram? I notice that you have changed your question as the original question stated \"AB is 10m\" and the diagram showed length of AB labeled as 10m. The original question also stated 133 m² and this is where the confusion comes.So, I change all metres and metres square to cm and cm² to make life simple.Question 7 - In the diagram show above, O is the centre of the circle and OAB is a right angle triange. Given that AB is 10cm and the shaded parts of the circle add up to 133 m square. Find the area of the circle.
Square of length of AO+Square of length of OB=10cmx10cm (http://en.wikipedia.org/wiki/Pythagorean_theorem)
but length of AO=length of OB (radii of circle)
Assume length of AO be n, so
n²+n²=100
2n²=100
n²=50
Area of triangle AOB = 1/2xABxOB=1/2xn²=1/2x50=25 cm²
Since area of the shaded part of the circle was given as 133 cm², area of the circle = (25+133) cm² = 158 cm².
Need to go now and mum will continue the rest.
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Ler:
Questions 10. Joanne and Tomomi bought the same bag from the same shop when they went shopping together . Johanne spents 75% of her money on the bag and Tomomi spent 2/3 of hers. What percentage of their total sum of money was the cost of a bag if the girls had $100 left altogether? (round off your answer to the nearest tenth).
75% = 3/4
At first
Joanne: 4u
Tomomi: 3p
Spent (cost of a bag)
Joanne: 3u
Tomomi: 2p
Left
Joanne: u
Tomomi: p
Left -> $100 (given)
u+p = 100
Joanne and Tomomi bought the same bag means spending by both girls were the same -> 3u=2p
Since 3u = 2p,
u+p =100 can be rewritten as 3u+3p=300
2p+3p=300
5p=300
p= 60
u = 100-60=40
Total sum of money -> 4u+3p = 4(40)+3(60)= $340
Cost of a bag = 3u or 2p -> 3(40) or 2(60) = $120 in both cases.
Percentage of the total sum of money that was the cots of a bag = 120/340x100% = 35.3% (nearest tenth)Ler:
Pls refer to http://psle2010a.blogspot.com/2010/09/decimal-p6-2010-sa2-maha-bodhi-p2-q12.html.Questions 12. Talik was given some pocket for recess, He realised that if he had spent $0.80 on each meal, he would have 8 meals fewer than if he had spent $0.60 on 8 meals and spent $0.80 on the remaining meals. How many meals did the money last him?
Here's one using algebra:
Assume the number of meals be n if Talik had spent $0.80 on each meal.
$0.80xn = $0.60x( n+8 )
0.8n=0.6n+4.8
0.2n=48
n=24
So, total pocket money = 24x$0.80 = $19.20
Number of remaining meals -> [$19.20-(8x$0.60)]÷$0.80=$14.40÷$0.80=18
18+8=26
The money lasted him for 26 meals.Ler:
It's difficult for KSP readers to solve this question without seeing the diagram, anyway here's my suggested solution:Q14.The diagram above, not drawn to scale, shows the dimensions of wheels of Kens bicycle. he pushed his bicycle down a slope 3m long. How many complete revolutions did the wheel make?
(sorry cant diagram)
Radius of wheel = 3+9+(6÷2)=3+9+3=15 cm
Diameter = 30 cm
Circumference = 3.14x30=94.2 cm = 0.942 m
Number of revolutions = 3÷0.942 = 3.184713.... which was 3 complete revolutions.
Note: Question states that pi = 3.14
VC's mum -
Ler:
You need to post the complete questions with diagrams and given answers (Don't worry if they are 100% correct or not) to allow other KSP members to help you.Hi mathguru or hi all
I am poor in math, can somebody help me to answer
Maha Bohdhi SA2 Paper 1 (2010)Ler:
Ratio of school pocket moneyQuestion 25, For every $2 that I get ...
I : My sister
2 : 2+1
2 : 3
Mother gives us $30,
2u+3u=5u
5u = $30
3u = $30÷5x3=$18
My sister gets $18Ler:
This one is not easy to explain without a diagram.Look at the question again and you will see that each circle has 7 units since it stated that 2/7 of each circle overlaps the one before.Question 26, The figure above of 4 idential cirlces....
Fill in the units in the diagram from left to right and you will get :
(5+2+3+2+3+2+5)units = 22 units which is the whole figure that consists of 4 identical circles.
Fraction of the figure that is one circle = 7/22Ler:
This one is also difficult to explain without a diagram.Questions 27, During a science experiment....
OK, look at the question again and you will see that:
1 litre = 1000 ml
0.75 litre = 750 ml
Beaker A: (1000ml÷10)x1= 100 ml
Beaker B: (500ml÷10)x7=350 ml
Beaker (750ml÷10)x3=225 ml
Beaker (A+B+C) = (100+350+225)ml = 675 ml
Beaker C is a 0.75l = 750 ml with intervals of 10 divisions.Each division = 75 ml
675 ml ÷ 75 ml = 9
So, the water level must be at the 9th marking of beaker C to show that the amount of water is 675 ml.
VC's mum
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