У*4=720. 580:х=20. с+30=123. 820-а=157. с*4=640.

Question

У*4=720. 580:х=20. с+30=123. 820-а=157. с*4=640.

Answer 1

180*4=720
580:29=20
93+30=123
820-663=157
160*4=640

Answer 2

Y*4=720
y=720/4
y=180       180*4=720
580:x=20
x=580:20
x=29          580:29=20
c+30=123
c=123-30
c=93          93+30=123
820-a=157
a=820-157
a=663       820-663=157
c*4=640
c=640:4
c=160        160*4=640