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 yearsB14 yearsC17 yearsD15 yearsAnswer: A. 16 years Read Explanation: Average age of 4 girls = 12 yearsSo, total age of 4 girls = 12 × 4 = 48 yearsSum of ages of 3 girls = 7 + 12 + 13 = 32 yearsAge of the fourth girl = 48 − 32 = 16 yearsFinal Answer: 16 years Read more in App