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3 December, 19:20

The sum of (-9) and a number (n) is multiplied by 1/2. the result is 20. what is the number?

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Answers (2)
  1. 3 December, 19:45
    0
    Step-by-step explanation:

    1/2 (-9+n) = 20

    n=40+9

    n=49
  2. 3 December, 20:32
    0
    49

    Step-by-step explanation:

    Sum means add

    -9+n

    Multiply this by 1/2

    1/2 (-9+n)

    This is equal to 20

    1/2 (-9+n) = 20

    Solve

    Multiply each side by 2 to get rid of the fraction

    2*1/2 (-9+n) = 20*2

    -9+n = 40

    Add 9 to each side

    -9+9 + n = 40+9

    n = 49
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