Today, from Xiaogao to Laichang to buy vegetables, radish is 2.2 yuan/kg, broccoli is 3.3 yuan/kg, lettuce is 10.8 yuan/kg, and fungus is 22 yuan/kg. In the end, he spent a total of 124 yuan, and he bought four kinds of vegetables. Integer kilograms. So how many kilograms of lettuce did Xiao Gao buy in total?
今天由小高到莱场买菜，萝卜2.2元/千克，西兰花3.3元/千克，莴笋10.8元/千克，木耳22元/千克，最后他共花了124元，且四种莱各买了正整数千克．那么小高共买了多少千克莴笋．
<result>7</result>