Tutor MathsGuru: Ask me for your burning Maths questions!

[Herbie]

Sorry, but i dun understand why

Total no. of women = 1u= 1+1p

where else total no. of men = 3u+1 = 4p

Can explain again?

Many thanks!

[adhdadhd]

Herbie:

Sorry, but i dun understand why

Total no. of women = 1u= 1+1p

where else total no. of men = 3u+1 = 4p

Can explain again?

Many thanks!

Mrs Lim is a woman and part of the group in the party, Mr Li is a man likewise, they must be counted as 1.

[abc_parent]

Thanks to small, Dharma, VanillaCake!

[Vanilla Cake]

Herbie:

Can help to solve the qn below:

A group of people met at a party. Each person shook hands with everyone. Mr Li shook hands 3 times as many men as women. Mrs Lim shook hands with 4 times as many men and women.
How many men and women are there?

I dun understand the model solution provided by Mr tianzhu.
Can someone explain the solution again????Many thanks!

Hi Herbie,
For your reference and other readers to take note that your question had been posted twice before by Tianzhu on http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&postdays=0&postorder=asc&start=150 and by Hifive on http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=6373&postdays=0&postorder=asc&start=500.

http://www.postimage.org/image.php?v=gx2w0utS by lizawa on http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&postdays=0&postorder=asc&start=150
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=6373&postdays=0&postorder=asc&start=500 by CoffeeCat on Wed Mar 10, 2010 3:29 pm
http://www.postimage.org/image.php?v=TsEKQ9A by Mathsguru on http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=6373&postdays=0&postorder=asc&start=500 plus her comments.
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=6373&postdays=0&postorder=asc&start=510 by persistent on 10 Mar 2010 23:14
and also a similar question using the same concept to solve by http://www.onsponge.com/images/fbfiles/files/AtParty_ShakeHands.pdf in another http://www.onsponge.com/forum/35-thinkingmathonsponge/2250-p6-maths.html.

Submitted by VC's mum.

[tisha]

JayT:

Is it possible to solve the question below by models? Thanks, Mathsguru for setting up this thread!


In the begining, the ratio of Alan's marbles to Kevin's marbles was 3:4. After Alan bought another 9 marbles and Kevin lost 18 marbles, the ratio becomes 3:2. find the number of marbles Alan had at first.

http://www.postimage.org/image.php?v=aV4jPui

[small]

JayT:

Is it possible to solve the question below by models? Thanks, Mathsguru for setting up this thread!


In the begining, the ratio of Alan's marbles to Kevin's marbles was 3:4. After Alan bought another 9 marbles and Kevin lost 18 marbles, the ratio becomes 3:2. find the number of marbles Alan had at first.

Hi JayT,

Hope this helps.

http://www.postimage.org/image.php?v=aV4z3Oi

[abc_parent]

Hi to all gurus,


I have 2 questions.
Q1) 144 marbles are divided equally among some children. If there were 4 children fewer, each child would have 18 marbles. How many children are there?

Q2) A group of 145 girl guides and 306 boy scouts were selected to performance at the National Day Parade. Two days prior to the performance, one of the girl guides sprained her ankle and had to withdraw from the performance. The remaining girl guides and boy scouts are to be divided into groups such that each group contains x girl guides and y boy scouts.

Q2a) What is the largest number of groups that could be formed?
Q2b) Hence, state the value of x and y.

Answer to Q1) I don’t have but I work out to be 16 by guess check.
Answer to Q2a) 18
Answer to Q2b) x = 8, y = 17

[Maths Monster]

delete

[mathsguru]

firebird:

Dear Mathsguru


Good morning.

Please, kindly,help me on some of the questions from Henry Park Primary School SA2 2009. Two of the questions contains diagrams, which I am unable to attach herewith using the PDF format. Very sorry for the inconvience caused. The quetions are:

1)Paper 1, booklet B, Question 16 : Write 3 thousands, 4 ones, 6 tenths and 18 hundredths as decimal.

2) Paper 1, booklet B, Question 19, with diagram :The diagram below is made of 4 semiclirles. The diameter of the biggest semicircle is 28 cm. Find the perimeter of the shaded figure. Express the answer in terms of pie.

3) Paper 1, booklet B, Question 21 : The average of 3 different odd numbers is 5. What is the largest possible value of one of the numbers?

4) Paper 1, booklet B, Question 29 : The ratio of the number of boys in the liabrary was 4: 5. After a group of boys entered the liabrary, 40% of the new total number of children were girls. What percentage increase in the number of boys?

5) Paper 2, Question 6 : Sharon bought M pens and 3 note books for $5. Each pen cost 40 cents. Express the cost of 1 notebook in terms of M.

6) Paper 2, Question 12, with diagram : Tank P was filled with water as shown in the diagram below. Water was then poured from Tank P to Tank Q until the height of the water level in Tank P became twice that of the water level in Tank Q. Find the volume of water in Tank Q. Give your answers in litres.

7) A librarian counted the number of adults in the library and found that 2/5 of the number of women was equal to 2 times the number of men. When another 12 men entered the library and 45 women left the library, the ratio of the number of women to men became 5:2.

b) Find the number of women at first.

Many thanks
firebird

Hi Firebird,

So sorry for the late reply! Mid-year exam \"fever\" for me too these couple of weeks. Now I have to \"clear\" the backlog of questions over here...Trying my best to come up with the solutions as soon as I can!

Here are my solutions! Hope they help~~

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=aV71ZtS

http://www.postimage.org/image.php?v=aV720Z0

http://www.postimage.org/image.php?v=aV723t9

http://www.postimage.org/image.php?v=aV725Yi

http://www.postimage.org/image.php?v=aV728sr

http://www.postimage.org/image.php?v=aV72aXA

http://www.postimage.org/image.php?v=aV72drJ

[mathsguru]

Herbie:

Hi Maths Guru,


Can help to provide solution for the qn below:

Amy spent $320 of her income and saved the rest.
When she decreased her spending by 45%, her savings increased by 60%
How much was her income?

How to explain to the child that $320 is treated at 100% to work out the 45% decreased in spending?


Questions on percentage are quite confusing cos some times A+B = 100% and sometime A=100% and B= 100%. How to we tell which is which, when we read the qn? Can enlighten me?

Tx

Hi Herbie,

Here's my solution and explanation on how to tackle % questions.

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=TsGGHN0