plz jawab sama caranya yah

1. 52/91 = 4/7
jawabannya = c
2. 3/5 ; 30% ; 1 3/8 ; 1,35
3/5 ; 30/100 ; 11/8 ; 135/100
160/800 ; 240/800 ; 1100/800 ; 1080/800
jawabannya = a
3. 3 1/8 - 1 5/12
25/8 - 17/12
75/24 - 34/24
41/24 = 1 17/24
jawabannya = c