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2 April, 08:22

Fred completed 10 math problems. This is 40% of the number of math problems he has to do. How many math problems must he do?

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Answers (2)
  1. 2 April, 08:24
    0
    25 math problems

    Step-by-step explanation:

    He completed 10 out of x, or the total he has to do.

    10/x

    We know that this equals 40%

    10/x=40/100

    Cross multiply to solve

    40*x=100*10

    40x=1000

    Divide both sides by 40

    x=25

    He must do 25 math problems
  2. 2 April, 08:33
    0
    25 problems

    Step-by-step explanation:

    10 problems = 40%

    1 problem = 4 %

    5 problems = 20%

    5 problems (20%) x 5 (to get 100%) = 25 problems
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