CMAT 2018 - Slot 1 Reasoning Question 6
This is a detailed step-by-step solution for CMAT 2018 - Slot 1 Reasoning Question 6. Understand the concept, common mistakes, and expert tips to solve similar questions in CMAT exam.
Reasoning
125 small cubes have been together, so we have a 5x5x5 cube.
So, if we want to cover it completely we've need to cover all the sides of it completely, we will just put same cubes over the one of the sides of it and then from both the sides we've to spread it just by one row and so it will cover it properly, and do it for all the other sides.
So, now we will have a 7 x 7 x 7 cube.
Thus, number of cubes required to cover it = (7 x 7 x 7) - (5 x 5x x 5) = 218