Apackage of 3 shirts costs $12.90. if every shirt costs the same, how many shirts can be purchased for $55.90

13 shirts

Step-by-step explanation:

First you try to find the amount for one shirt by dividing $12.90 by 3 which equals $4.30. Then you try to find the amount of shirts for $55.90 by dividing 55.90 by 4.30 which results into the final answer 13.