How to divide the oil between Pleasant Goat and Big Big Wolf?

10-7=3; 7-3-3= 1; 9-7=2; 7-2=5; 3+2=5; Note: First, pour 10 kg of oil into the 7 kg oil tank, then pour 3 kg of oil pot from the 7 kg oil tank, and then pour 3 kg of oil pot into the 10 kg oil tank. After repeated pouring twice, there is 1 kg oil left in the 7 kg oil basket, and then pour this 1 kg oil into the 3 kg oil pan. At this time 10 kg. Then pour three catties of oil pan from the seven catties oil basket. At this time, the original 1 catty in the three-catty oil pan is full, and then two catties are poured into it, so there are five catties left in the seven-catty oil pan, and the three-catty oil pan and the1catty oil pan are just five catties. All right! Half a person.