If Shamim were twice as old as he is now, he would be 40 years older than Kamal. If Kamal is 10 years younger than Shamim, how old is Shamim now?

A 20

B 30

C 35

D 40

Correct Answer: Option B

S - K = 10 ............ 1

2S - K = 40 ........... 2

2 - 1, we get,

2S - S = 40 - 10

S = 30