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This is division in an algebra problem. Let X be your number.

45% of X = 72

written out (45/100) X = 72

simplified 0.45X = 72

divide both sides by (0.45) and X = 72/ (0.45) and X = 160

(.45) (160) = 72 check

45 % of 160 is 72

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Q: 45 percent of what number is 72?
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