A store has twice as many printed cloths as white cloths. If it sells 40 meters of white cloth and 60 meters of printed cloth every day, after a few days, all the white cloths will be sold out, and there will be 120 meters of printed cloth left. How many meters is the original stock calico?
某商店库存花布是白布的2倍，如果每天卖出40米白布和60米花布，几天以后，白布全部卖完，而花布还剩120米．原来库存花布多少米？
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/40) * 60</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">2 - (3/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">120 / (1/2)</gadget>
<output>240</output>

<gadget id="calculator">2 * 240</gadget>
<output>480</output>

<result>480</result>