Christmas MT's answer to Jodi Lim's Primary 6 Maths question.
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15.
Age difference doesn't change, so we want to find "before" and "after" ratios such that the unit difference doesn't change.
From here, it is easy to see that 7 units --> 21 years.
16.
This one is easier. 8 years later their combined age will be 72, so right now their combined age is 56. Split that age into the corresponding ratio and work from there.
Age difference doesn't change, so we want to find "before" and "after" ratios such that the unit difference doesn't change.
From here, it is easy to see that 7 units --> 21 years.
16.
This one is easier. 8 years later their combined age will be 72, so right now their combined age is 56. Split that age into the corresponding ratio and work from there.
Date Posted:
7 years ago
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