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Average mass of d,k,l 42 .D is 6 kg heavier than average mass of k and l .k is 6 kg heavier than l. Find mass of d

  • Maths -

    what do we know?

    (d+k+l)/3 = 42
    d = 6+(k+l)/2
    k = l+6

    So, start substituting:

    d+l+6+l = 126
    2d = 12+l+6+l
    or,

    d+2l = 120
    2d-2l = 18

    Add these to get

    3d = 138
    d = 46

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