Answer: 1. 3/4 2. 15/4 or 3 3/4 3. 3/5 4. 25/2 or 12 1/2 6. 91/6 or 15 1/6

Step-by-step explanation:

1. 3/10 ÷ 2/5= 3/10 ÷ 5/2= 3/10 x 5/2= 15/20= 3/4

2. 1 1/4 ÷ 1/3= 5/4 ÷ 1/3= 5/4 x 3/1= 15/4 or 3 3/4

3. 6/15 ÷ 2/3= 6/15 x 3/2= 18/30= 6/10= 3/5

4. 2 1/2 ÷ 1/5= 5/2 ÷ 1/5= 5/2 x 5/1= 25/2 or 12 1/2

6. 6 1/2 ÷ 3/7= 13/2 ÷ 3/7= 13/2 x 7/3= 91/6 or 15 1/6