Earl answered 2 more math questions correctly than Anna did. Anna answered 3 fewer questions thatn Juanita did. Juanita answered 21 questions correctly. How many questions did Earl answer correctly? Could someone explain how to get the answer. Thanks.

2 answers

Juanita answered 21, and Anna answered three fewer than this, so Anna must have answered 18. Earl answered two more than Anna, so Earl must have answered... what?
20