SSC CHSL Model Paper 18

Let the present ages of Ram and Shyam be x and y.
(x - 10) = 5(y - 10)
x - 5y = - 4 0 .....(I)
(x + 20) = 2(y + 20)
x - 2y = 20 .....(II)
Solving (I) and (II), y = 20 years
Thus, Shyam is 20 years old