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5 March, 16:50

Rita bought some large packets of salt weighing 500grams each and some small packets of salt weighing 200 grams each. If she has 8 packets altogether and they weigh 2200 grams in total, how many of each kind does she have?

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  1. 5 March, 17:54
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    L+S=8, L=8-S

    500L+200S=2200, using L from above in this equation gives you:

    500 (8-S) + 200S=2200

    4000-500S+200S=2200

    4000-300S=2200

    -300S=-1800

    S=6, and since L=8-S:

    L=2

    So Rita bought 2 large packets and 6 small packets.
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