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primary 6 | Maths | Ratio
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Oliver
Anonymous

primary 6 chevron_right Maths chevron_right Ratio chevron_right Singapore

Age question

Date Posted: 7 months ago
Views: 37
J
J
7 months ago
Ratio now : 2 : 5
Difference = 3 units

Ratio 14 years later = 5 : 9
Difference = 4 units

The difference in their ages will always be the same. So we should make the units the same.

2 : 5 → 8 : 20
Difference = 12 units

5 : 9 → 15 : 27
Difference = 12 units

27 - 20 = 7
15 - 8 = 7

So there is an increase of age of 7 units.
7 units = 14 years
1 unit = 2 years.

Use this to find Siti's age now and then the required answer (not sure 5 or 6 years ago as the picture is not very clear)

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Keith Lincoln Lee
Keith Lincoln Lee's answer
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Hope this helps