Crackers contain 15 calories each and cookies contain 50 calories each. If Jimmy eats 7 cookies, how many crackers does he need to eat to have consumed a total of 500 calories?
He has consumed 7 * 50 = 
<gadget id="calculator">7*50</gadget>
<output>350</output>
350 calories from the cookies.
He needs to consume 500 - 350 = 
<gadget id="calculator">500-350</gadget>
<output>150</output>
150 more calories.
He should eat 150 / 15 = 
<gadget id="calculator">150/15</gadget>
<output>10</output>
10 crackers.

<result>10</result>