<gadget id="calculator">47 - 8</gadget>
<output>39</output>

<result>39</result>
Thomas had some Pen. William gave him 8 more. Now Thomas has 47 Pen. How many Pen did Thomas have to begin with?
Thomas had some Pen. William gave him 8 more. Now Thomas has 47 Pen. How many Pen did Thomas have to begin with?