Question

The smallest number by which 2560 must be multiplied so that the product is a perfect cube is:

• A. 5
• B. 25
• C. 10
• D. 15

Answer 1

Answer: (B)

25

$2,560=\underset{–}{2\times 2\times 2}\times \underset{–}{4\times 4\times 4}\times 5$
Clearly, on multiplication, by $5\times 5=25$, it becomes a perfect cube.