peaches for 4 apples, 1 pear for 3 apples, and 1 pear for how many peaches.
8个桃子换4个苹果，1个梨换3个苹果，一个梨换多少个桃子．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>