Question P6 Constant total
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The ratio of Mei's stickers to Jun's stickers was 7 : 3. After Mei gave some stickers to Jun, the ratio became 3 : 2. Together they had 120 stickers throughout. How many stickers did Mei give to Jun?
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Money moves between two people, so their total never changes.
In this one. Stickers only move between the two children, so the total never changes — which means both ratios are describing the same 120, and each one can be turned into real numbers on its own.
One person gives, sells or loses an amount to the other, and nobody outside the two people gains or loses anything.
Children draw different totals before and after, or forget that moving an amount from one person to the other changes the gap between them by twice that amount.
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