Ten words? Hurry up and give me an early warning

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