Question 741789
 The present age of Amit is 30 years and that of his son is 6 years.
 in how many years Amit's age will be double that of his son's age?
:
Let y = no. of yrs for A to twice his son's age
:
y + 30 = 2(y+6)
y + 30 = 2y + 12
30 - 12 = 2y - y
18 = y
:
A will be twice son's age in 18 yrs
:
:
Check that:
A: 30+18 = 48
S:  6+18 = 24