A worksheet had 2 problems on it. If a teacher had 14 worksheets to grade and had already graded 7 of them, how many more problems does she have to grade?
<gadget id="calculator">14 - 7</gadget>
<output>7</output>

<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<result>14</result>