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## Question

primary 6 | Maths
| Ratio

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Fraction..pls help

2/9 is as good as saying 2 units out of 9 units.

Aisha gets 2 units. Neighbour gets the same. Also 2 units.

Stamps tingfeng has left

= 9 units - 2 units - 2 units

= 5 units.

Aisha has same number of stamps as him now. She also has 5 units.

Their total = 10 units.

Now if Aisha gives 66 to tingfeng, he would have 4 times as much as her.

This means she has 1/5 of their total and tingfeng has 4/5 of their total.

So Aisha's stamps after that

= 1/5 x 10 units

= 2 units

(Or 10 units ÷ 5 = 2 units)

Units she gave to tingfeng

= 5 units - 2 units

= 3 units

3 units = 66 stamps

1 unit = 66 stamps ÷ 3 = 22 stamps

Stamps they had altogether at first

= Their total now + 2 units the neighbour got from tingfeng

= 10 units + 2 units

= 12 units

12 x 22 stamps

= 264 stamps

b)

Aisha's stamps at first

= Their total at first - tingfeng's at first

= 12 units - 9 units

= 3 units

Total they paid for the stamps at first

= 3 units x $0.15 + 9 units x $0.20

= 3 x 22 x $0.15 + 9 x 22 $0.20

= $49.50

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