<gadget id="calculator">39 - 2</gadget>
<output>37</output>

<result>37</result>
Sarah had some Pen. Esperanza gave him 2 more. Now Sarah has 39 Pen. How many Pen did Sarah have earlier?
Sarah had some Pen. Esperanza gave him 2 more. Now Sarah has 39 Pen. How many Pen did Sarah have earlier?