Three sisters have an average age of 14 years. When their mother is included, the average age of the four becomes 20 years. Find the mother's age (in years).

Question

Accepted Answer

38. Sisters' total = 3 × 14 = 42. Total of four = 4 × 20 = 80. Mother's age = 80 − 42 = 38 years.

Three sisters have an average age of 14 years. When their mother is included, the average age of the four becomes 20 years. Find the mother's age (in years).

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