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Start Cube Drilling

Stage: 1 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

Thank you to those of you who sent in solutions to this problem: James from Kings Road Primary School, Harry from Great Addington and Robert from Ashmead Combined School. A group from The King's School, Macclesfield explained very clearly how they visualised the solution:

The first drilling drilled through 12 cubes in total from front to back.
The second drilling drilled through 12 cubes as well from top to bottom, but 8 of them were already drilled through. So 4 cubes were newly drilled.
So, 12 + 4 = 16 cubes were drilled through altogether.