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Best Answer

400

Let x = the number

10% of x = 40

0.10 x = 40

0.10x/0.10 = 40/0.10

x = 400

check:

10% of 400 = 40

0.10 * 400 = 40

40=40

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12y ago
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Q: 10 percent of what number equals 40?
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