Tutor MathsGuru: Ask me for your burning Maths questions!

[Yu Xuan]

beauty queen:

There are more pupils in School A than School B. 30% of the pupils in School A is 45 more than 40% of the pupils in School B, If 10% of the pupils in School A leaves to join School B, there will be 200 more pupils in School A than School B.

(a) How many pupils are there in School B?

(b) How many percent less pupils are there in School B than School A? Leave your answer as fraction in the simplest form

please help

This is my method of solving;

3/10 A --> 4/10 B + 45
1/10 A --> 2/15 B + 15 [ this is 10% of A]
9/10 A --> 1 1/5 B + 135 [ this is 90% of A]

a)Hence if 10% of School A joins School B;
1 1/5B + 135 - (1B + 2/15B + 15) = 200
1 1/5B + 135 - 1 2/15B - 15 = 200
1/15B = 80
1B = 80 / 1/15 = 1200

b) 1/10A --> 2/15 (1200) + 15 = 175
10 / 10 A --> 1A --> 175 * 10 = 1750
1750 - 1200 = 550
550 / 1750 * 100% = 31 3/7 %

[Herbie]

Hi i hv one qn.

Mrs lim had twice as many ten dollar notes as two dollar notes at first. She bought a digital camera for $288 and pdid for it with thrice as many two dollar notes. Then she realised tat she had 4 times as many ten- dollar notes left.
how many pieces of two dollar notes did mrs lim have at firsT? How much money had mrs lim left after buying the digital camera?Tx

[Yu Xuan]

Herbie:

Hi i hv one qn.

Mrs lim had twice as many ten dollar notes as two dollar notes at first. She bought a digital camera for $288 and pdid for it with thrice as many two dollar notes. Then she realised tat she had 4 times as many ten- dollar notes left.
how many pieces of two dollar notes did mrs lim have at firsT? How much money had mrs lim left after buying the digital camera?Tx

D.Camera;
3u * 2 = 6u
1u * 10 = 10u
6u + 10 u --> 288
1u --> 288/16 = 18
$2--> 3 * 18 = 54
$10 --> 1 * 18 = 18

Initially
$10 --> 2p
$ 2 --> 1p

After spending on D.Camera;
$10 --> 2p - 18
$2 --> 1p - 54

2p - 18 = 4 (1p - 54)
2 p = 198
1 p = 99 ($2 at first)

b) $10 --> (2*99 - 18 ) * $10 = $1800
$2 --> (99-54)*$2 = $90
Total --> $1800 + $90 = $1890

Are these the answers?

[CJM]

Vanilla Cake:

ksi:

[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 ?

P = 96-W
3(96-W) + 7W = 560
4W = 560-288 = 272
W = 68

Mr Lim sold 68 watermelons.

Hi CJM,
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 : )

[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 ?

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.

[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 ?

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

[Ngserene617]

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 !

[liketoeat]

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.

[Ler]

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 …

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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???

[Ler]

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)