25% of the total length of a piece of fabric is used for the first time, and 1.5 meters more than the first time is used for the second time, leaving 4.5 meters left. How many meters is the original length of this piece of fabric?
一块布料第一次用去全长的25%，第二次比第一次多用1.5米，还剩4.5米，这块布料原来长多少米？
<gadget id="calculator">4.5 + 1.5</gadget>
<output>6</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 / (1/2)</gadget>
<output>12</output>

<result>12</result>