Answer:
1) 1/3
2) 1/2
3) 4/1
4) 3/4
5) 2/5, 4/10, 4:10, 4 to 10
6) 3:4, 6/12, 6:12, 6 to 12
7) 3 to 1, 9/3, 9:3, 9 to 3
8) 7/9, 14/18, 14:18, 14 to 18
9)
a) 3/2
b) 3/5
c) 27:18
10) 96 birds visited the feeder
11)
a) nuts row: 3, 6, 9, 12
raisins row: 4, 8, 12, 16
b) 7.5 cups
12)
a) This ratio means that for every 9 boys in the school there are 10 girls
b) 570 students