B is 50, which is A's (1/3), ask A.
乙是50，是甲的(1/3)，求甲．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">50 / (1/3)</gadget>
<output>150</output>

<result>150</result>