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15 November, 19:08

DeSean is Sorting his rock collection. 2/3 of the rocks are metamorphic, and 3/4 of the remainder are igneous rocks. If the 3 rocks left over are sedimentary, how many rocks does DeSean have?

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  1. 15 November, 19:29
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    2/3 of the rocks are metamorphic

    3/4 of the remainder are igneous rocks

    3 rocks left over are sedimentary

    the rocks that deSean has are

    2/3+3/4+3 = 4x2+3x3/3x4 + 3 = 17+36 / 12 = 20

    DeSean had 20 rocks
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