The sister has 120 stamps, which is less than the elder sister (1/3), how many stamps does the elder sister have?
妹妹的邮票120张，比姐姐少(1/3)，姐姐的邮票多少张．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">120 / (2/3)</gadget>
<output>180</output>

<result>180</result>