Question

Parikshit makes a cuboid of plasticine of sides 5 cm, 2 cm, 5 cm. How many such cuboids will he need to form a cube?

Answer 1

Given numbers $=5\times 2\times 5$
Since, Factors of 5 and 2 both are not in group of three.
Therefore, the number must be multiplied by $2\times 2\times 5=20$ to make it a perfect cube. Hence he needs 20 cuboids.