Five years ago the average age of 4 persons A, B, C and D was 45 years. If another person E is included in the group, then the present average age of all five persons becomes 49 years. What is the present age of E?
A45 years ✓ Correct
B50 years
C43 years
D48 years
Correct answer: (A) 45 years
Explanation
E's present age is 45 years.
Five years ago the 4 had sum 4 x 45 = 180.
Their present sum = 180 + 4 x 5 = 200.
For five people now, sum = 5 x 49 = 245.
So E = 245 - 200 = 45 years.
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