Question P6 Constant part
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The ratio of Ali's savings to Ben's savings was 3 : 5. After Ali saved another $24, the ratio became 9 : 10. How much did Ali have at first?
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The ratio changes, but one person's amount stays the same.
In this one. Ben's money never moves, so make Ben's share the same number of parts in both ratios — 3 : 5 = 6 : 10 against 9 : 10 — and the $24 is the 3-part gap that is left.
A ratio changes and the question tells you only one person gained or lost an amount, while the other kept what they had.
Children keep the same number of shares for the person whose amount did not change. The amount stays the same, but the size of a share can differ between the two ratios.
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