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Best Answer

90 because...

4/5=.8

x•.8=72

72/.8=90

(• is a multiplication sign, so you don't get it confused with x, which is equal to 90)

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Wiki User

14y ago
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Anonymous

Lvl 1
4y ago

Thirtyeigththirtyfifth

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Q: Seventy-two is four fifths of what number?
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