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Add 15to a number then multiply the result by 3 the answer is the same as subtracting 4 from the number and multiplying the result by 5 find the number

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1 answer

  1. 3(x+15) = 5(x-4)
    3x + 45 = 5x - 20
    -2x = -65
    x = 32.5 <----- the number

    check:
    add 15 to 32.5 ---> 47.5
    multiply 47.5 by 3 ---> 142.5

    subtract 4 from 32.5 --> 28.5
    multiply by 5 --> 142.5

    my answer is correct.

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