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29 January, 06:06

If a certain number is added to the numerator and denominator of 5/11, the result is 7/10. find the number.

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  1. 29 January, 07:18
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    Let's represent the number by x.

    x+5/x+11=7/10 (cross multiply) 9+5/9+11=14/20=7/10

    (x+5) * 10 = (x+11) * 7

    10x+50=7x+77

    10x+50-50=7x+77-50

    10x=7x+27

    10x-7x=27

    3x=27

    3x/3=27/3

    x=9

    therefore the number is 9
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