For a fundraiser, Nellie needs to sell 45 rolls of gift wrap. So far, she has sold 1 roll to her grandmother, 10 rolls to her uncle, and 6 rolls to a neighbor. How many more rolls of gift wrap does Nellie need to sell?
The number of rolls already sold is 1 + 10 + 6 = 
<gadget id="calculator">1+10+6</gadget>
<output>17</output>
17.
Nellie needs to sell 45 - 17 = 28 more rolls of gift wrap.

<result>28</result>