39th B.P.S.C. (Pre) 1994
Find the lowest number, which should be multiplied into 56,700, so that it becomes a perfect square-
a3
b6
c7✓ Correct
d9
Explanation
56,700 = 2 × 2 × 3 × 3 × 3 × 3 × 5 × 5 × 7 It is clear that, on multiplying by 7, number 56700 will become a perfect square.
general-mental-ability
