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primary 5 | Maths | Rate & Ratio
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Lily
Lily

primary 5 chevron_right Maths chevron_right Rate & Ratio chevron_right Singapore

Help pls

Date Posted: 1 week ago
Views: 46
J
J
1 week ago
It is very likely that your question has an error.

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
J
J
1 week ago
Alternatively, use 77 instead of 72.

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
J
J
1 week ago
Consult the teacher in school when you have the opportunity. Very certain the question has erroneous values.

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Oliver
Oliver's answer
17 answers (Tutor Details)
1st
Hi!

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!