supermarket has 3 checkout lanes, which can be settled in 25 minutes, and 6 checkout lanes, which can be settled in 15 minutes. It takes 5 minutes to complete the settlement, how many do you need to open?
某超市开3个结帐通道，25分可结算完，开6个结账通道，15分钟可结算完，要5分钟结算完，需开几个？
<gadget id="calculator">37.5 / 5</gadget>
<output>7.5</output>

<gadget id="calculator">6 * 15</gadget>
<output>90</output>

<gadget id="calculator">3 * 25</gadget>
<output>75</output>

<gadget id="calculator">90 - 75</gadget>
<output>15</output>

<gadget id="calculator">25 - 15</gadget>
<output>10</output>

<gadget id="calculator">15 / 10</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">7.5 + (3/2)</gadget>
<output>9</output>

<result>9</result>