Ratio of present age of A and B is 7 : 13 . After 6 years the ratio of age of B and C will be 5 : 3. If the present age of C is 21 years, then after 3 years age of A will be:
Answer & explanation
Correct answer: option 2
Present age of C = 21
After 6 years C's age = 27
ATQ, after 6 years ratio ⇒ B : C = 5 : 3
⇒ 3R = 27
⇒ 1R = 9
⇒ B's age after 6 years = 5R = 45
⇒ Present age of B = 45 - 6 = 39
Now,
Present age of A and B ⇒ 7R and 13R
⇒ 13R = 39
⇒ 1R = 3
⇒ A's present age = 7R = 21
⇒ After 3 years age of A = 21 + 3 = 24 years