Q&A - PSLE Math

[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

[Suz855]

Thks TZ, think the school wants the students to think out of the box.

[fightingmom]

Hi,


Can someone help with the following question:

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TIA !

[tianzhu]

fightingmom:

Hi,


Can someone help with the following question:

http://i47.tinypic.com/c2lxx.jpg\">

TIA !

Hi

This question has been discussed earlier.

Best wishes

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