Venus is at the deli to get subs for a party. She needs 81 inches of sub. The shop sells 5 and 8 inch subs. If she buys two 8 inch subs, how many 5 inch subs does she need to buy?
The two 8 inch subs total 16 inches because 2 x 8 = 
<gadget id="calculator">2*8</gadget>
<output>16</output>
16.
She still needs 65 inches of sub because 81-16 = 
<gadget id="calculator">81-16</gadget>
<output>65</output>
65.
She needs to buy 13 five inch subs because 65 / 5 = 
<gadget id="calculator">65/5</gadget>
<output>13</output>
13.

<result>13</result>