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Multiple choice

The average age of A, B and C is 10 years. If the average age of A and C is 9 years, then what will be the age of B?

  1. 9

  2. 10

  3. 11

  4. 12

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Average age of A, B, C = 10 years means total age = 30 years. Average age of A and C = 9 years means their combined age = 18 years. Therefore, B's age = 30 - 18 = 12 years.

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