Irfan mother is twice as old as him. She is also 20 years older than him. Guess the ages of Irfan and his mother.

Question

$\begin{array}{11} (a)\; 20, 30 \\ (b)\; 30, 40 \\ (c)\; 20, 40 \\ (d)\; 30, 20 \end{array}$