A members-only speaker series allows people to join for $16 and then pay $1 for every event attended

A members-only speaker series allows people to join for $16 and then pay $1 for every event attended. What is the maximum number of events someone can attend for a total cost of $47?

Subtract the join fee from the total cost:
$47 - $16 = $31

Now divide this number by the cost per event:
$31 / $1 = 31 events