The store buys a batch of electric kettles. On the first day, 25% of the remaining unsold electric kettles are sold, and 40 are sold on the second day. In this way, the ratio of sold to unsold electric kettles is 3:4. How many pots are there?
商店进回一批电壶，第一天卖出的是剩下没有卖的25%，第二天卖出40个，这样卖出与剩下没卖出的比是3：4，这批电壶有多少个？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 / (1/2)</gadget>
<output>80</output>

<gadget id="calculator">80 * (3/4)</gadget>
<output>60</output>

<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<result>140</result>