Answer:
9 boxes
Step-by-step explanation:
The least amount of boxes ordered will be 9 boxes which would be 81 shirts.
79 is a prime number which means that it can only be divided by one and itself (79).
We also know that 8 × 9 is 72 so that wouldn't work. But, when we do 9 × 9 we get 81 which fits the requirement of 79 shirts and only gives us 2 extra shirts!
