James has 18 chocolate bars to sell for the swim team. He sold 5 last week and 7 this week. How many more chocolate bars does he need to sell?
He has sold a total of 5 + 7 = 
<gadget id="calculator">5+7</gadget>
<output>12</output>
12 chocolate bars so far.
James needs to sell 18 - 12 = 
<gadget id="calculator">18-12</gadget>
<output>6</output>
6 more chocolate bars.

<result>6</result>