There is a batch of goods in the warehouse, if 5 large trucks and 4 small trucks are used, it can be shipped in 10 days; if 3 large trucks and 8 small trucks are used, it can be shipped in 12 days. Then, how many days can 7 large trucks and 12 small trucks transport all the goods.
仓库有一批货，若用5辆大卡车和4辆小卡车10天可以运完；若用3辆大卡车和8辆小卡车12天也能将货运完．那么，7辆大卡车和12辆小卡车多少天可以将这批货全部运完．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>