lets see...lets apply a simple ratio...
(56/f) = (64/100)
64(f) = 5600
87.5 = f = your answer O.O
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56 percent of 64 is 35.84
56/64 x 100 = 87.5 percent
To get at least 64% you can miss at most 100 - 64 % = 36 % Percent means "out of 100" 36 % of 56 = 36/100 x 56 = 20.16 → Can miss 20 questions.
To find 62.5 percent of a number, multiply that number by 0.625. In this instance, 0.625 x 64 = 40. Therefore, 62.5 percent of 64 is 40.
To find 75 percent of a number, multiply the number by 0.75. In this instance, 0.75 x 64 = 48. Therefore, 75 percent of 64 is equal to 48.