The number 72

The number 72 increased by 25%. By how much % will you have to reduce the number you created to get the number 72 again?

Correct answer:

p =  20

Step-by-step explanation:


72·(1+25/100)·(1-p/100)=72

90p = 1800


p = 1800/90 = 20

p = 20

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