A bag contains five stones, three of which weigh x pounds each and two of which weigh y pounds each. What is the total

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A bag contains five stones, three of which weigh x pounds each and two of which weigh y pounds each. What is the total weight of the stones?

(1) The heaviest combination of three stones has a total weight of 13 pounds.

(2) The lightest combination of three stones has a total weight of 12 pounds.

Answer: E

Source: Veritas Prep