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8 September, 20:39

David took 10 1/2 hours over 3 days to build airplane. he spent 3 1/4 hrs the firsr day and 4 2/3 hours the second day. how many hours did he spend the third day to finish?

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  1. 8 September, 21:48
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    2 7/12 hours

    X=101/2 - (3+4+1/4+2/3)

    X=101/2 - 7 + (1/4+2/3)

    1/4+2/3 = 11/12

    101/2 - 7 = 3 1/5

    X = 3 1/5 - 11/12 = 2 7/12
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