-28
15 + 13 + 11 = 39
17 plus 15 plus 13 equals 45.
It is: 13/15 plus 1/13 = 184/195
The answer is 270. Simply add up all of the numbers arithmetically like you would for two plus two. To make sure the answer is correct, check your work using a calculator.
13 + 15 = 28
15+6 is 21. 13 + what is 21? 21 - 13 is 8 Eight
3 + 11 + 11 + 11 + 12 + 13 + 15 + 15 + 16 + 17 + 19 = 143
13
13 + 2 = 15
-15
-2 + 15 = 13
-15