11. Reduce to its lowest form:
14:21, means divide to its simplest form
2:3 divide by 7
12. Divide 28$ in my case to a ratio of 2:5
28/7 because 2+5 = 7
now split the 7ths into 2 7ths on one side, and 5 on the other
4(1/7) x 2 = 8
4 x 5 = 20
8:20
Can't see the last one so Hope this helped!