Answer:
42= 20 +h
Explanation:
Given from the problem statement
Melissa has made 20 zebra-printed hats
and Rachel has made h amount of striped hats
and also the total amounts of hats made by both of them is 42 hats
We can write a simple equation for the scenario as

We can solve the equation to know the amount of hats made by Rachel

Hence Rachel has made 22 hats