Dr. Harry wants to know how many candies Susan consumed during the week. Susan tells him she bought 3 on Tuesday, 5 on Thursday, 2 on Friday. If she has only 4 of them left, how many did she eat?
She had bought 3+5+2 = 
<gadget id="calculator">3+5+2</gadget>
<output>10</output>
10 candies over the week.
She has only 4 left which means she ate 10-4 = 
<gadget id="calculator">10-4</gadget>
<output>6</output>
6 candies during the week.

<result>6</result>