Let the sides of a rectangular prism are consecutive multiples of 5. Which among the following could be the base area
Answers:
A) 360  B) 450  C) 560  D) 670  E) 780

Rationale: length = 5 * a breadth = 5 * ( a + 1 ) or 5 * ( a + 2 ) base area - > multiple of 25 450 = 25 * 18 answer : b
Answer: B