She can not fit more than twenty rows in the class so anything equal to twenty or less (not including zero or negative numbers) would be fine. We don't have a limit for how many chairs in a row so I'm answering assuming that is not a problem so 20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2, or 1 row(s) would be possible
At first you would subtract 39 from 60. Then you would do 21/5.5 and you would get 3.818… and due to the fact you can't go over 60 you would round to 3 and not 4
The answer is 12. Steps If that number is x (3+x)/(8+x)=3/4 "Cross multply" 4(3+x)=3(8+x) 12+4x=24+3x x=12 To check: add 12 to 3 and 8. 3+12=15 and 8+12=20. 15/20=3/4
