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26 April, 11:22

Alice's stamp collection was 75% of the size of Raymond's. After Alice sold 40% of her stamps and Raymond sold 20% of his stamps, Alice had 140 fewer stamps than Raymond. How many stamps did Alice sell?

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  1. 26 April, 11:45
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    Raymond's stamp collection ➞x

    Alice′s stamp collection➞75%x

    75%x-40%*75%x+140=x-20%x

    75%x-30%x+140=80%x

    45%x+140=80%x

    140=80%x-45%x

    x=400

    Raymond′s stamp collection ➞400

    Alice′s stamp collection➞300

    Alice sold 300*40%=120

    Answer:120
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