Father and son - age ratio = 1:2
Statement: After 4 years, Mr. Sharma will 4 times his son's age of 9 years ago.
Then, lets express in equation form-
Mr. Sharma age = s
Son age= r
r = s/2 or s = r2
after 4 years...
s+4 = (r - 9)*4
Impossible Answer -
The answer to this question cannot be found. It is impossible as both the person's age is unknown. So, I have just expressed Mr. Sharma and his son's ages in mathematical expressions.