The price of a pair of trousers is reduced by 15 yuan, that is, it is sold at a 25% discount. What is the original price of the trousers?
一条裤子降价15元，也就是打七五折销售，这条裤子原价是多少元．
<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">15 / (1/4)</gadget>
<output>60</output>

<result>60</result>