B) 40 year

C) 33 year

D) 50 year

Five years ago ages of A and B are A – 5 , B – 5

So Averge , (A + B)/ 2 = 15

[(A – 5) + (B – 5)]/2 = 15

A + B – 10 = 30

A + B = 40 ……….(i)

Now average ages of A , B and C is 20

( A + B + C)/3 = 20

A + B + C = 60 ……… (ii)

Putting equation (i) into (ii)

40 + C = 60

C = 20

After 10 years C = 20 + 10 = **30**

**Related MCQs:**

- Four years ago the average age of A, B and C was 25 years. Five years ago the average of B and C was 20 years. A’s present is:
- Five years ago, the average age of A, B, C and D was 45 years with E joining them now, the average of all the five is 49 years. How old is E?
- Five years ago the average of A and B was 15 years Average age of A, B and C today is 20 years how old will C be after 10 years.
- The average age of A, B, C, D, and E is 40 years. The average age of A and B is 35 years and the average of C and D is 42 years. Age of E is?