Which is the smallest number divides 2800 and gives a perfect square.
Answers
A) 5  B) 6  C) 7  D) 8  E) 9

Rationale: 7 is the smallest number which divides 2800 and gives a perfect square . as 2800 = 2 * 2 * 2 * 2 * 5 * 5 * 7 and 7 is not in a pair which gives 400 ( a perfect square of 20 ) on dividing 2800 . answer : c
Answer: C