我上次与爷爷去交水费时,我们还去了水表那儿看了一下。水表圆圆的,里面有4个圆圈圈。第一个指向3,第二个指向2,第三个指向3,最后一个指向4,我算了一下:一共是3+2+3+4=1 2。可水表上边明明写着00620啊!这时,爷爷开口了:“上个月我们家水表写#00603哦!”哦!这个月我们用了620-603=17吨。可是呢,这个月用水费可不是17x1.8=30.6元哦!“上个月我们用了33.6元哩!那这个月……”爷爷想了会 When I last paid my grandpa fee, we went to the water meter and looked at it. Round water meter, which has 4 circle circle. The first one points to three, the second one to two, the third one to three, and the last one to four. I figured it out for a total of 3 + 2 + 3 + 4 = 1 2. At the moment, my grandpa said: “Last month our water meter wrote # 00603!” Oh! “This month we used 620-603 = 17 tons. However, this month’s water fee is not 17x1.8 = 30.6 yuan Oh! ”Last month we used 33.6 yuan miles! That month ... ..." Grandpa thought for a while