Question

At a store clearance, a women spent less than $200 on shirts that were labeled $15 each . How many shirts did she buy? Identify the numbers that are included in the solution set .

Answer 1

She bought about 13 shirts.  You just divide the numbers

Answer 2

We know that a women spent less than $200 on shirts.
We also know that the shirt were labeled $15 each, which means the price od each shirt is $15. 
In order to find the number of shirts the women bought  (denoted with X) we should divide the total amount of cash spent with the numbers of shirt she has bought.
X=$200/$15
X=$13.33
Because it is not logical to buy 0.33 shirt (it must be whole), we can conclude that the women bought 13 shirts.