Question

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.
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

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