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## Question

primary 5 | Maths
| Rate & Ratio

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Help pls

Maybe you can change the ⅓ to ½ instead.

Concept : equal fractions (numerator)

Make the units the same by changing the numerator to the same number.

For gold, 1/2 = 2/4

For silver, we can leave it as 2/5

So we can now say that:

There were 4 units of gold balloons and 2 units were used.

There were 5 units of silver balloons and 2 units were used.

Total balloons = 4 units + 5 units = 9 units

9 units = 72 balloons

1 unit = 72 balloons ÷ 9 = 8 balloons

Number of balloons used = 2 units × 2

= 4 units

= 4 × 8

= 32

Concept : equal fractions (numerator)

Make the units the same by changing the numerator to the same number.

For gold, 1/3 = 2/6

For silver, we can leave it as 2/5

So we can now say that:

There were 6 units of gold balloons and 2 units were used.

There were 5 units of silver balloons and 2 units were used.

Total balloons = 6 units + 5 units = 11 units

11 units = 77 balloons

1 unit = 77 balloons ÷ 11 = 7 balloons

Number of balloons used = 2 units × 2

= 4 units

= 4 × 7

= 28

### See 1 Answer

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There seems to be an issue with the question as the number of balloons needs to be a whole number instead of a number with decimal (26.18).

Nonetheless, the final answer isn't the most important. What's more important is the thought process to achieving the answer.

Hope the steps for the thought process helps!

Thank you!