Q&A - PSLE Math

[tianzhu]

kay22:

Can someone help me with the following question:


Susan has some $0.50, $0.20 and $0.10 coins. The value of the coins she has is in the ratio 5:21:15. She used 4/7 of the $0.50 coins and 98 of the $0.20 coins and she left $270.40. What is the percentage of $0.50 coins does she has?

:roll:

Hi

Could you share where this question is from?

I interpret the sentence highlighted in blue as showing the number instead of value of money because it states she uses 98 of the $0.20 coins.

But I’ve a sum of $247.40 instead of $270.40.

Best wishes

[Tiramisu Coco]

MathIzzzFun:

Tiramisu Coco:

Hi tianzhu, here's the link to the qtn. TIA


http://m.flickr.com/#/photos/82618212@N07/7837766706/

http://i47.tinypic.com/rucz06.png\">

cheers.

:thankyou: MathIzzzFun

[pandu]

A slice of cheesecake cost $4. A bun cost 25% as much as a slice of cheesecake. Alice paid $154 for some slices of cheesecake and buns. 40% of what she bought were buns. How many slices of cheesecake did she buy?

[daddy_psp]

pandu:

A slice of cheesecake cost $4. A bun cost 25% as much as a slice of cheesecake. Alice paid $154 for some slices of cheesecake and buns. 40% of what she bought were buns. How many slices of cheesecake did she buy?

25% of $4 = $1
A bun costs $1.

40% of what she bought were buns. Therefore for every 2 buns, there are 3 cheesecake (2:3). Think of this as a group of buns and cheesecakes. Each group will cost $14 (2 buns = $2, 3 cheesecakes = $12).

Alice paid $154 altogether. $154/$14=11. There are 11 groups of buns and cheesecakes. Remember each group has 3 cheesescakes.

3 * 11 = 33

She bought 33 slices of cheesecake.

[Suz855]

A can buy 10 fries n 4 burgers using all his money. If he decided to buy 5fries n 5 burgers, he will be short of $10.50. Find A's pocket money.


Pls help thks

:oops:

[mamago]

Suz855:

A can buy 10 fries n 4 burgers using all his money. If he decided to buy 5fries n 5 burgers, he will be short of $10.50. Find A's pocket money.


Pls help thks

:oops:

10F + 4B = 1u
5F + 5B = 1u +$10.50
x2
10F + 10B = 2u + $21

6B= 1u + $21
1B= 5F + $10.50
x6
6B= 30F + $63

1u + $21 = 30F + $63
30F- 1u = $63 - $21
=$42

15F - 1/2u = $21

6B = 1U + 15F - 1/2u
6B = 1/2u + 15F
6B = 5F + 2B + 15F
6B = 20F + 2B

2B = 20F -----> 10F = 1B
4B = 40F


50F = 1u
F = 1/50u
5B = 1u
B = 1/5u

5F + 5B = 5(1/50u) + 5(1/5u)
= 5/50u + 1u

5/50u = $10.50
1u = $10.50 x 10
= $105

[Suz855]

Hi,


From the step 6b=20f+2b
How did u come to 2b=20f

:oops:

[Bunny27]

Can someone help on the following question:


1. Tom and Joe spend a total of $7000 in a shopping spree. 3/5 of the amount spend by Tom was equal to 1/3 of the amount spend by Joe. Who spend more money? How much more?

Thank you …

[MathIzzzFun]

Bunny27:

Can someone help on the following question:


1. Tom and Joe spend a total of $7000 in a shopping spree. 3/5 of the amount spend by Tom was equal to 1/3 of the amount spend by Joe. Who spend more money? How much more?

Thank you ...

3/5 of Tom = 1/3 of Joe
3/5 of Tom = 3/9 of Joe
Tom --> 5 units
Joe --> 9 units
Total 14 units

Tom --> 5/14 x $7000 = $2500
Joe --> $7000 - $2500 = $4500

cheers.

[MathIzzzFun]

Suz855:

A can buy 10 fries n 4 burgers using all his money. If he decided to buy 5fries n 5 burgers, he will be short of $10.50. Find A's pocket money.


Pls help thks

:oops:

Hi

Could you share the source of the question ? As it is, there are multiple answers, for eg:
10 fries --> $5, 1 burger --> $13.00, total amount --> $57
or
10 fries --> $7.50, 1 burger --> $14.25, total amount --> $64.50

cheers.