If 4/5 of a number is 16, what is 1/5 of the number?

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1 Answer

⅕ is a quarter of ⅘ so ¼ of 16 = 4, ⅕ of the number.

(The number is 4×5=20, and ⅘ of 20=4×20/5=16 and ⅕ of 20=20/5=4.)
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