If A is B (1/3), if A+B=120, then BA=how much.
如果A是B的(1/3)，若A+B=120，则B-A=多少．
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 30</gadget>
<output>90</output>

<gadget id="calculator">90 - 30</gadget>
<output>60</output>

<result>60</result>