On Tuesday Jennifer bought 5 boxes. On Wednesday half of all the boxes were destroyed. On Thursday there were only 20 left? How many boxes did she half on Monday?

She had had  29  boxes on Monday.

Step-by-step explanation:

Let m represent the number of boxes Jennifer had on Monday.

She bought  5  boxes on Tuesday  which would bring the number of hats she had to   m  +  5

Half of her boxes were destroyed on Wednesday, so on Thursday she would have   m + 5/2 boxes

We are told this number equals  17

so

m+5/2 = 17

m + 5 = 34

m = 29

A. part is the answer okay