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primary 6 | Maths | Ratio
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Chong Yi Ting
Chong Yi Ting

primary 6 chevron_right Maths chevron_right Ratio chevron_right Singapore

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Date Posted: 4 months ago
Views: 62
J
J
4 months ago
We let the ratio at first be in terms of units
and the ratio in the end be in terms of parts.

At first →Adult : children = 3 units : 4 units
In the end →Adult : children = 3 parts : 2 parts

Adults : 3 units + 18 = 3 parts
So 1 unit + 6 = 1 part


Children : 4 units - 36 = 2 parts

Since we know 1 unit + 6 = 1 part,

4 units - 36 = 2 x (1 unit + 6)
4 units - 36 = 2 units + 12
2 units = 48
1 unit = 24

Number of adults at first
= 3 units
= 3 x 24
= 72

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Henry Tan
Henry Tan's answer
359 answers (A Helpful Person)
1st
Hi Yi Ting, I have uploaded steps by steps video presentation on YouTube https://youtu.be/GuZiuD1KtN8 , you can learn how to solve by yourself.