Multiple choice

Two numbers are 10% and 20% less than a third number. By what percent should the second number be increased to make it equal to the first number?

  1. 10

  2. 15

  3. 12.5

  4. 8
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the third number be 100. The first number is 90 (10% less) and the second is 80 (20% less). To increase 80 to 90, the increase is 10. Percentage increase = (10/80) * 100 = 12.5%.

AI explanation

Let the third number be 100. The first number is 90 and the second number is 80. To make the second number equal the first, it must be increased by 10. The required percentage increase is 10 divided by 80, which equals 12.5 percent.

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