Derek has $40. He spends $14 on lunch for himself, $11 for lunch for his dad, and $5 on more lunch for himself. His brother Dave has $50 and only spends $7 on lunch for his mom. How much more money does Dave have left than Derek?
Derek has 40-14-11-5 = 
<gadget id="calculator">40-14-11-5</gadget>
<output>10</output>
10 dollars left.
Dave has 50-7 = 
<gadget id="calculator">50-7</gadget>
<output>43</output>
43 dollars left.
Dave has 43-10 = 
<gadget id="calculator">43-10</gadget>
<output>33</output>
33 more dollars left than Derek.

<result>33</result>