suit jacket is 80 yuan more expensive than trousers, and the price of trousers is 75% of the jacket. How much is the trousers?
一套西装上衣比裤子贵80元，裤子的价格是上衣的75%，裤子多少元？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">80 / (1/4)</gadget>
<output>320</output>

<gadget id="calculator">320 - 80</gadget>
<output>240</output>

<result>240</result>