If A+B=60, and A/B=(2/3), then BA=how much.
如果A+B=60，且A/B=(2/3)，那么B-A=多少．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">36 - 24</gadget>
<output>12</output>

<result>12</result>