4 years ago, the average age of A, B, C and D was 45 years. What would be their average age after five 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?
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, each person has aged 4 years. So, the total age of A, B, C, and D now is 180 + 4*4 = 196 years.
After 5 more years, each person will age 5 more years. So, the total age of A, B, C, and D in 5 years will be 196 + 5*4 = 216 years.
The average age of A, B, C, and D in 5 years will be the total age divided by the number of people, which is 216 / 4 = 54 years. So, their average age after five years would be 54 years.
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