A rope is 100 centimeters long, and three quarters are used up, how many centimeters are used?
一根绳长100厘米，用去了四分之三，用了多少厘米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">100 * (3/4)</gadget>
<output>75</output>

<result>75</result>