9 plus 11 (20) plus 15 (35) plus 18 is equal to 53
4/9 x 2/2 = 8/18 5/18 + 8/18 = 13/18
7 + 1/6 + 13/18 = 126/18 + 3/18 + 13/18 = 142/18 = 71/9
7/20 + 9/10 = 7/20 + 18/20 = 25/20 = 5/4
18/26 = 9/13
12 + 16 + 18 + 20 + 9 = 75
9 plus 11 (20) plus 15 (35) plus 18 is equal to 53
It is: 5/18 plus 4/9 = 13/18
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210
4/9 x 2/2 = 8/18 5/18 + 8/18 = 13/18
24 + 23 + 22 + 21 + 20 + 19 + 18 + 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 300
7 + 1/6 + 13/18 = 126/18 + 3/18 + 13/18 = 142/18 = 71/9
18-the correct number should be 20.
7/20 + 9/10 = 7/20 + 18/20 = 25/20 = 5/4
18/20 - 5/20 = 13/20
5/9 + 1/6 is 13/18
9/10 + 13/4 = 2 13/20