Question

A warehouse has 3
shelves long enough to hold 6
boxes and high enough to hold
boxes. All the shelves are full.

There are blank boxes on the shelves in all.

Answer 1

I can't see the numbers in your message — some blanks are missing. Could you tell me the missing number (how many boxes high each shelf is)?

In general, if there are 3 shelves, each long enough for 6 boxes and high enough for h boxes, the total number of boxes is
3 × 6 × h = 18h.

Example: if each shelf is 4 boxes high, total = 18 × 4 = 72 boxes.