1) Two numbers differ by 5. If their product is 336, then the sum of the two numbers is : A) 21 B) 28 C) 37 D) 51 E) 56 Answer: Option CExplanation:Let the numbers be x and y. Then, x−y=5 and xy=336.(x+y)2=(x−y)2+4xy=25+4×336=1369⇒x+y=√1369=37.