The average age of 5 members in a family is 25 years. If the youngest member is 5 years old, what was the average age of the family at the time of their birth?
A20 years
B22 years
C25 years
D27 years
Explanation
Sum now = 125. 5 years ago, sum = 125 – (5 * 5) = 100. Average at that time (of 4 members) = 100 / 4 = 25.
Exam Relevance
- Topic: Averages
- Subtopic: Age Problems
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