Xinxin Computer City has newly purchased 240 computers, and sold 30% of them in the first 3 days. Based on this calculation, how many days will it take to sell out?
欣欣电脑城新进240台电脑，前3天卖出30%，照这样计算，还需要几天才能卖完？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) / 3</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">240 * (1/10)</gadget>
<output>24</output>

<gadget id="calculator">240 / 24</gadget>
<output>10</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<result>7</result>