Question

With what number should 1715 be divided to get a perfect cube?

• A. 2
• B. 7
• C. 5
• D. Already a perfect cube

Answer 1

The correct option is C

5

By prime factorisation we get 1715 = 7×7×7×5

We have three 7’s but only one 5 so we need to divide the number by 5.

This will give us 7 x 7 x 7, whose cube root will be 7.