1 16/27 : 1/6 = 43/27 : 1/6 = 43/27 * 6 = 86/9 = 9 5/9
18 : 24 = 18 * 1/24 = 3/4
21/40 * 3 17/21 = 21/40 * 80/21 =1680/840 = 2
2 * 1 7/36 = 2 * 43/36 = 43/18 = 2 7/18
9 5/9 * 3/4 = 86/9 * 3/4 = 43/6 = 7 1/6
7 1/6 : 2 7/18 = 43/6 : 43/18 = 43/6 * 18/43 = 3