steel bar is (5/8) meters long, and (1/4) is left after some of it is used up. How many meters is used up?
一根钢条长(5/8)米，用去一些后还剩(1/4)，用去多少米？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(5/8) * (3/4)</gadget>
<output>15/32 = around 0.46875</output>

<result>15/32 = around 0.46875</result>