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18 July, 00:08

The number of items on two grocery lists differs by 9. The total number of items for both lists is 33. How many items are on each list?

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  1. 18 July, 01:39
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    Let b>a

    b-a=9

    b=9+a

    ...

    a+b=33, using b found above in this we get:

    a+9+a=33

    2a+9=33

    2a=24

    a=12, and since b=9+a

    b=21

    So there are 12 items on one list and 21 items on the other list.
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