In the question below consists of a question and two statements numbered a and b given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give the answer. Question: In which year was Kalyan born ?<br />Statements:<br />a. Kalyan at present is 15 years younger to his mother.<br />b. Kalyan's brother, who was born in 1991, is 25 years younger to his mother.

Correct Answer: Both a and b are sufficient

From both a and b, we find that Kalyan is (25 - 15) = 10 years older than his brother, who was born in 1991. So, Kalyan was born in 1981.