Eight trucks of the same model are used to transport stones at the water conservancy project site, which can transport 1280 tons per day. According to this calculation, how many trucks need to be added to transport 1760 tons per day?
水利工程工地用同样型号的卡车8辆运石头，每天可以运1280吨．照这样计算，每天运1760吨，需增加同样的卡车多少辆？
<gadget id="calculator">1_280 / 8</gadget>
<output>160</output>

<gadget id="calculator">1_760 / 160</gadget>
<output>11</output>

<gadget id="calculator">11 - 8</gadget>
<output>3</output>

<result>3</result>