20
Idk
2 goes into 80 .....40 times
320/80 = 4
40 times.
2 can go into 80 forty times because 80 divided by 2 equals 40.
115-80
37 with remainder 40.
2 with remainder 40.
40 with remainder 41.
9 times with a remainder of 40 or 9.5 times
80 = 400/5
Eight times.
40 with 1 remaining 81 - 1 = 80 = 2 x 40