In which year was Shyam born ?
Statement I : Shyam at present is 20 years younger to his mother.
Statement II : Shyam's sister, who was born in 1965, is 30 years younger to his mother.
If the data in both statements I and II together are necessary to answer the question
. From both I and II, we find that Rahul is (30 - 20) = 10 years older than his brother, who was born in 1965. So, Rahul was born in 1955.