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if X is 10% of two other numbers,Y and Z,and Z is 3 times the value of Y.What percentage is X of Y alone ? please show me how you work it out,thanks

  • math -

    given: Z = 3Y

    Do you mean X is 10% of the sum of Y and Z ??

    If so, then
    X = (1/10) (Z + Y)
    = Z/10 + Y/10
    = 3Y/10 + y/10
    = 4Y/10

    percentage of X/Y
    = (4Y/10) / Y
    = 4/10 = 40/100 = 40%

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