4 years ago, the average age of A, B, C and D was 45 years. What would be their average age after five years?Options64 years48 years65 years54 years
Question
4 years ago, the average age of A, B, C and D was 45 years. What would be their average age after five years?
Options:
- 64 years
- 48 years
- 65 years
- 54 years
Solution
The average age of A, B, C, and D 4 years ago was 45 years. This means that the total age of A, B, C, and D 4 years ago was 45 * 4 = 180 years.
Since 4 years have passed, the total age of A, B, C, and D now is 180 + 4*4 = 196 years.
After 5 more years, the total age of A, B, C, and D will be 196 + 5*4 = 216 years.
Therefore, the average age of A, B, C, and D after 5 years will be 216 / 4 = 54 years.
So, the correct option is 54 years.
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