Question

A cube of side 5 is built with black and white cubes of side 1, so that the cubes next to each other have different colors and the corner cubes are black, as shown in the figure. How many white cubes were used?

Answer 1

Answer: 62

Explanation:

top row has 12

the next row has 1 more =13

and it alternates

12+13+12+13+12=62