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 $2\times 5\times 2=20$ to make it a perfect cube.

Hence, he needs $20$ cuboids.