Ratio of present ages of a father and son is 5 : 2 . After 4 years the ratio will become 2 : 1 . What is the difference in their present age ?
Answer & explanation
Correct answer: option 2
Ratio of → father : son
5 : 2
Let the present age father = 5x & present age of son = 2x
After 4 years ,
According to question ,
\(\frac{5x\;+\;4}{2x\;+\;4}\) = \(\frac{2}{1}\)
5x + 4 = 4x + 8
x= 4
Present age of father = 5x = 5 × 4 = 20
Present age of son = 2x = 2 × 4 = 8
Required difference = 20 - 8 = 12