Oceanside Bike Rental Shop charges 17 dollars plus 7 dollars an hour for renting a bike. Tom paid 80 dollars to rent a bike. How many hours did he pay to have the bike checked out ?
<gadget id="calculator">80 - 17</gadget>
<output>63</output>

<gadget id="calculator">63 / 7</gadget>
<output>9</output>

<result>9</result>