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.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e 16 years.
Average age of 4 girls = 12
So, total age = 12 × 4 = 48
Sum of three given ages = 7 + 12 + 13 = 32
Age of fourth girl = 48 − 32 = 16 years