Question

Mark (✓) against the correct answer
By what least number should 324 be multiplied to get a perfect cube?
(a) 12
(b) 14
(c) 16
(d) 18

Answer 1

(d) 18



324 = $2\times 2\times 3\times 3\times 3\times 3=2\times 2\times 3\times {\left(3\right)}^3$

Therefore, to show that the given number is the product of three triplets, we need to multiply 324 by $\left(2\times 3\times 3\right)$.
In other words, we need to multiply 324 by 18 to make it a perfect cube.