Father’s age is three times the sum of ages of his two children. After 5 years, his age will be twice the sum of ages of the children. What is the age of father in years?
a)	52	b)	50	c)	45	d)	None of these

Let the present age of father be years and sum of ages of his children be years.

∴ According to problem, we have                                                                                   …(i)

After 5 years, age of father=(years and sum of age of two children after 5 years =

According to problem we have,                                                 …(ii)

From (i) and (ii), we get years = Sum of ages of two children        

∴ Age of father = years.