a) 20/45 = 4/9 ; 15/35 = 3/7 ; 32/44 = 8/11
b) 15/108 = 5/36 ; 70/180 = 7/18 ; 20/255 = 4/51
c) 75/90 = 15/18 ; 77/99=7/9 ; 15/60 = 3/12
a) 20/25=20:5/25:5=4/5
15/25=15:5/25:5=3/5
32/44=32:4/44:4=8/11
b)15/108=15:3/108:3=5/36
70/180=70:10/180:10=7/18
20/255=20:5/255:5=4/51
c)75/90=75:15/90:15=5/6
77/99=77:11/99:11=7/9
15/60=15:15/60:15=1/4