A is 120, which is 30 less than B's (1/3), what is B's number?
甲是120，比乙数的(1/3)少30，乙数是多少．
<gadget id="calculator">120 + 30</gadget>
<output>150</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">150 / (1/3)</gadget>
<output>450</output>

<result>450</result>