Five Star Electric has a batch of computers. It sold 30 units in the first week, and 25% of the total in the second week. At this time, the ratio of the number of units sold to the number of remaining units is 3:5. How many units are there in this batch?
五星电器有一批电脑，第一周卖出30台，第二周卖出总数的25%，这时已卖的台数与剩下的台数比是3：5，这批电脑有多少台？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">(3/8) - (1/4)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">30 / (1/8)</gadget>
<output>240</output>

<result>240</result>