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12 April, 08:37

A+b-c = 170 B+c-A = 130

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  1. 12 April, 08:55
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    The correct answer is A = 110, B = 40, C=20 ...

    Explanation

    If A+B-C = 170 and B+C-A=130,

    =C+A = 130

    or, C = 130 - A

    Again, A+B-C = 170

    or, A+B = 170+C

    A+B = 170+130-A (c=130-A)

    A+B = 300-A

    2A+B = 300

    A+B = 300/2

    A+B = 150

    A+B-C = 170

    A+B = 170+C

    150 = 170 + C (A+B = 150)

    or, C = 20 ... (1.)

    A+C = 130

    or, A + 20 = 130 (A=110) ... (2)

    A+B = 150

    110+B = 150

    B = 150-110

    B = 40 ... (3)

    Therefore, A = 110, B = 40, C=20 ...
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