Buy tomatoes, choose three, and weigh them.

The bearded man said: "One and a half catties, three pieces of seven." ”

He said: "It's just a soup, don't need more." "Then go to the great one.

The bearded man snorted, weighed again, and said: "One catty, two taels, three pieces." ”

Passers-by hated their deception, and they wanted to stop it, and when they saw that they calmly took out seven hairs, they took the big tomato and went away.