Ten words? Hurry up and give me an early warning
Gutian
One word for ten people
The cross is in the mouth, Tian
The cross is above the mouth, ancient
The average value of the four numbers of ABCD is 80. If one of the numbers a is changed to 60, the average value becomes 50, and a is 80
One minute. Come on
80×4-50×4=120
A=120+60=180