Answer:
1. 3:4
2. 1 : 3
3. 3 : 1
4. 1 : 5
5. 2: 5
Step-by-step explanation:
1. 3:4 (because 9÷3 is 3 and 12÷3 is 4)
2. 1:3 (because 2÷2 is 1 and 6÷2 is 3)
3. 3:1 (because 21÷7 is 3 and 7÷7 is 1)
4. 1:5 (because 3÷3 is 1 and 15÷3 is 5)
5. 2:5 (because 4÷2 is 2 and 10÷2 is 5)
