Steve bought a total of 6 packages of pens, and each package contained either 3 or 7 pens. If exactly 4 of the packages Steve bought contained 7 pens, how many pens did Steve buy?

A 34

Explaination

If Steve bought 4 packages of 7 pens and 6 packages total, then he must have purchased 2 packages of 3 pens : 4(7)+2(3)=28+6=34.

B 17

C 21

D 42

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