Raghu’s age after 15 years will be 5 times his age 5 years back. What is the present age of Raghu ?

\par Let Raghu's present age be x years. Then,

\par Raghu's age after 15 years = (x + 15) years.

\par Raghu's age 5 years back = (x - 5) years.

x + 15 = 5(x - 5)

x + 15 = 5x - 25

4x = 40
x = 10