Four years ago, the average age of A and B was 20 years. If today average age of A, B and C is 25 years, what will be age of C after 7 years?
Answer & explanation
Correct answer: option 2
Sum of age of A and B (4 years ago) = 20 x 2 = 40
Sum of age of A and B (Present) = 40 + 8 = 48
Sum of age of A, B and C (Present) = 25 x 3 = 75
Present age of C = 75 - 48 = 27 years
C's age after 7 years = 27 + 7 = 34 years