Question P6 Constant part
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Mei and Sam collect stickers. The ratio of Mei's stickers to Sam's stickers was 2 : 3. Mei then received 18 more stickers as a gift, so the ratio became 5 : 6. How many stickers did Mei have at first?
Answer
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The ratio changes, but one person's amount stays the same.
In this one. Sam's stickers never changed — so rescale the first ratio until Sam has the same number of parts in both, and the 18 stickers are exactly the leftover part.
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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