Practice Quiz

GMAT Math Practice Test #1

Category - Math

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If 36 is 30 percent of 30 percent of a certain number, what is the number?

  1. 9
  2. 36
  3. 81
  4. 400
Explanation

Answer: D

Assume the original number is 100. Its 30% is 30. Again 30% of 30 are 9. Thus 9 are 30 percent of 30 percent of 100. Hence 36 are 30 percent of 30 percent of 400.

Key takeaway: In such percent problem, do not add percents. For example 30% of 30% is not 60%. It is 9%.

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