Q&A - PSLE Math

[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.

[Suz855]

It’s a recent school prelim qn, did you use guess n check? Can show how you work out one of the multiple answer, thks

[tianzhu]

Suz855:

It's a recent school prelim qn, did you use guess n check? Can show how you work out one of the multiple answer, thks

Hi

From the way the question is crafted, it gives rise to multiple answers.

Why, because the price of a burger varies according to the price of 5 fries + 10.5.Hence, you’ll get different amount of pocket money.

If you modify the question, then you can get one answer.

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.Given that the price of 1 burger is $13, find A's pocket money.

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.Given that the price of 10 fries is $5, find A's pocket money.

Best wishes