divide-help with these?

Question

2/3 by 3/5
7/12 by 2/3
3 1/2 by 3/4?

Answer 1

1) 2/3 by 3/5
=2/3 * 5/3
=10/9

2) 7/12 by2/3
=7/12 * 3/2
=7/8

3) 1/2 by 3/4
=1/2 * 4/3
=2/3

Answer 2

For dividing fractions we invert the second fraction and do a multiplication. So here it goes

1. 2/3 by 3/5 = 2/3*5/3 = 10/9

2. 7/12 by 2/3 = 7/12*3/2 = 7/4*1/2 = 7/8

3. 3 1/2 by 3/4 = 7/2*4/3 = 7*2/3 = 14/3 = 4 2/3