No. The sum is 65.
1/2 + 3/4 + 5/7 = 14/28 + 21/28 + 20/28 = 55/28
It is: 55 -28 = 27
28
It is: (28+82)/2 = 55(28 + 82)/2 = 55
28/55 is in its simplest form.
55
20+35+40+55+60+55+80=345
The LCM of 28 and 55 is 1540
55 plus 553 is 608
180
3/4 + 7/9 = 27/36 + 28/36 = 55/36 which cannot be simplified further.