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11 April, 22:31

85 is 40% of what number

A: 212.5

B: 47.1

C: 34

D:45

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Answers (2)
  1. 11 April, 22:57
    0
    A: 212.5

    Step-by-step explanation:

    1. We assume, that the number 212.5 is 100% - because it's the output value of the task.

    2. We assume, that x is the value we are looking for.

    3. If 212.5 is 100%, so we can write it down as 212.5=100%.

    4. We know, that x is 40% of the output value, so we can write it down as x=40%.

    5. Now we have two simple equations:

    1) 212.5=100%

    2) x=40%

    where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

    212.5/x=100%/40%

    6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

    7. Solution for what is 40% of 212.5

    212.5/x=100/40

    (212.5/x) * x = (100/40) * x - we multiply both sides of the equation by x

    212.5=2.5*x - we divide both sides of the equation by (2.5) to get x

    212.5/2.5=x

    85=x

    x=85
  2. 11 April, 22:59
    0
    212.5

    Step-by-step explanation:

    is/of=%/100
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