Q&A - P5 Math

[tinasen]

Thank you very much Chamonix. It was schoolwork for my DS and I was struggling with it. Now I get it with your clear MD. Thanks a lot.

chamonix:

tinasen:

Can someone help with a solution (Model methos) to solve this question pls.
Weichong and Rama collect stamps. If Rama gives Weichong 15 stamps, he will have the same number of stamps as Weichong. If Weichong gives 15 stamps, he will have 1/2 as many stamps as Rama. How many stamps does each boy have?
Answer is be Rama 105 and WeiChong 75

http://i56.tinypic.com/2uo4eaq.png\">

[Winx5015]

Need help to solve some math questions.


Q1). 5/7 of Mike’s money is equal to 2/3 of Rachel’s money. Rachel has $1600 more than Mike. If Mike spends 5/8 of his money, how much money will he have left?

Q2). Sue has some money. She spends $100 on 3 identical bags and 7 identical belts. If she wants to buy another bag, she will be short of $4. However, if she buys 1 more belt, she will have $6 left. How much money does Sue has?

Q3). Paul baked some tarts. He sold 2/5 of them in the morning and 2/7 of the remainder in the afternoon. he sold 472 more tarts in the morning than in the afternoon. If each tart was sold for $0.87, how much did Paul collect from the sales? Give your answer to the nearest dollars.

Thanks!

[MathIzzzFun]

Winx5015:

Need help to solve some math questions.


Q1). 5/7 of Mike's money is equal to 2/3 of Rachel's money. Rachel has $1600 more than Mike. If Mike spends 5/8 of his money, how much money will he have left?

Thanks!

Hi

Q1.
5/7 of mike’s money = 2/3 of rachel’s money
--> 10/14 of mike’s money = 10/15 of rachel’s money
So, mike's money to rachel’s money = 14u : 15u

1u = $1600, mike’s money left = 3/8 x 14 x $1600 = $8400

cheers.

[MathIzzzFun]

Winx5015:

Need help to solve some math questions.


Q2). Sue has some money. She spends $100 on 3 identical bags and 7 identical belts. If she wants to buy another bag, she will be short of $4. However, if she buys 1 more belt, she will have $6 left. How much money does Sue has?

Thanks!

Hi

1 bag = [money left] + $4
1 belt = [money left] - $6
1 bag cost $ 10 more than a belt.

3 bags + 7 belts = 10 belts + $30 = $100, 10 belts = $70, 1 belt = $7
Sue’s money left = $ 7 + $6 = $ 13

cheers.

[MathIzzzFun]

Winx5015:

Need help to solve some math questions.


Q3). Paul baked some tarts. He sold 2/5 of them in the morning and 2/7 of the remainder in the afternoon. he sold 472 more tarts in the morning than in the afternoon. If each tart was sold for $0.87, how much did Paul collect from the sales? Give your answer to the nearest dollars.

Thanks!

Hi

Total number of tarts = 35u
Sold 2/5 in morning= 2/5 x 35u = 14u
Sold 2/7 of remainder in afternoon = 2/7 x (35u - 14u) = 6u
So, 14u -6u = 8u = 472, 1u = 59

Total sold = 14u + 6u = 20u = 20 x 59 = 1180

Total amount collected from sales = 1180 x $0.87 = $ 1026.60 = $1027 (to nearest dollar)

cheers.

[ozora]

MathIzzzFun:

ozora:

need some help in the following question http://i52.tinypic.com/15p4a2x.jpg\">

Hi

P + R = Q + S = 1/2 area of rectangle.

S = P + R -Q

cheers.

thanks

[Winx5015]

Hi MathIzzzFun,


Thanks for solving my problems. Really appreciates it:)

Good nite!

[MathIzzzFun]

Winx5015:

Hi MathIzzzFun,


Thanks for solving my problems. Really appreciates it:)

Good nite!

u r welcome

bonjour !

cheers.

[anneshirleygilbert]

Can somebody please help with this question?

There are 85 plates of fried noodles for 80 people. Each adult eats 2 plates of fried noodles and every 3 children share 1 plate of fried noodles. How many adults and how many children are there? (Ans given is: 35 adults and 45 children)

Is there an alternate method to Guess and Check? G&C in an exam takes too long.

Thank you.

[tianzhu]

anneshirleygilbert:

Can somebody please help with this question?

There are 85 plates of fried noodles for 80 people. Each adult eats 2 plates of fried noodles and every 3 children share 1 plate of fried noodles. How many adults and how many children are there? (Ans given is: 35 adults and 45 children)

Hi

You may use a strategy called “Make a Supposition”.

This question is similar to the familiar ‘Counting heads and legs” type but given a slight tweak.

Suppose there were 80 adults.

80*2 ------ 160

Now increase a group of 3 children, hence you’ll have 77 adults to make a total of 80 people.

(77*2) + 1 ------ 155.

For every increase of 3 children, we see a reduction of 5 plates of fried noodles (160 - 155)

160 – 85 ------ 75

75/5 ----- 15

For a reduction of 75 plates, you have to reduce the number of children by 15 groups of 3.

Hence (15*3) or 45 chilldren.

80 - 45 ------ 35 (adults)

Best wishes