A father is now three times old as his son. Five years back he was four times as old as his son. The age of the son in years is
A23
B15
C18
D20
Answer:
B. 15
Read Explanation:
Let sons age be x year and fathers age 3x year five years ago, father's age = (3x - 5) year
son's age = x - 5year
(3x - 5) = 4(x - 5)
3x - 5 = 4x - 20
x = 15