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The average of four girls' age is 12 years. The ages of three of them are 7, 12 and 13 years. Find the age of the fourth girl.

A16 years

B14 years

C17 years

D15 years

Answer:

A. 16 years

Read Explanation:

Average age of 4 girls = 12 years

So, total age of 4 girls = 12 × 4 = 48 years

Sum of ages of 3 girls = 7 + 12 + 13 = 32 years

Age of the fourth girl = 48 − 32 = 16 years

Final Answer: 16 years


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