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21 August, 16:09

A+b+c+d=770

a+b=c+d

a-b=49

c-d=211

Find numbers.

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Answers (1)
  1. 21 August, 17:45
    0
    A+b = c+d

    a+b = 770/2 (a+b+c+d = 770)

    a+b = 385

    c+d = 385

    a+b+a-b = 385+49

    2a = 434

    a = 434/2

    a = 217

    a-b=49

    217-49 = b

    b = 168

    c+d+c-d = 385+211

    2c = 596

    c = 596/2

    c = 298

    c-d = 211

    c-211 = d

    298-211 = d

    d = 87

    Therefore, a=217, b=168, c=298, d=87
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