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25 November, 14:18

A certain number is subtracted from 20. the result multiplied by 3 is equal to 45. what is the number?

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Answers (2)
  1. 25 November, 14:31
    0
    Let the number is x

    so 20-x=20-x

    now 3 * (20-x) = 45

    60-3x=45

    -3x=45-60

    -3x=-15

    x=-15/-3

    x=5

    So the required number is5
  2. 25 November, 14:36
    0
    The correct number is 15
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