The original price of a kind of clothing is 120 yuan per set, and the price of the trousers is 1/3 of that of the top. How much does it cost to buy a shirt alone?
一种服装原价每套120元，其中裤子的价钱是上衣的(1/3)．单买一件上衣多少元？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">120 / (4/3)</gadget>
<output>90</output>

<result>90</result>