If 30% of a number is 90, what is the number?

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Multiple Choice

If 30% of a number is 90, what is the number?

Explanation:
When a percent of a number is given, treat the percent as a decimal and set up an equation. Here, 30% is 0.3, so 0.3 × x = 90, where x is the unknown number. Solving for x by dividing both sides by 0.3 gives x = 90 ÷ 0.3 = 300. You can confirm by a quick check: 0.3 × 300 = 90. The other numbers would yield smaller results when multiplied by 0.3, so they don’t match the given 90.

When a percent of a number is given, treat the percent as a decimal and set up an equation. Here, 30% is 0.3, so 0.3 × x = 90, where x is the unknown number. Solving for x by dividing both sides by 0.3 gives x = 90 ÷ 0.3 = 300. You can confirm by a quick check: 0.3 × 300 = 90. The other numbers would yield smaller results when multiplied by 0.3, so they don’t match the given 90.

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