60 - 28 = 32; 32/2 = 16. This is the smaller number so the other is 16 + 28 ie 44.
3 and 84.
no
67 and 99
1 + pi, 1 - pi. Their sum is 2.
There are 3 whose sum is 45 whose sum is 57 whose sum is 69 whose sum is 711 whose sum is 813 whose sum is 915 whose sum is 1017 whose sum is 1119 whose sum is 1219 whose sum is 1317 whose sum is 1415 whose sum is 1513 whose sum is 1611 whose sum is 179 whose sum is 187 whose sum is 195 whose sum is 203 whose sum is 211 whose sum is 22.
137?
The sum of a single number is itself. So the only number whose sum equals 2 is 2.
19
There are no 5 odd numbers whose sum is 50. (The sum of 5 odd numbers is an odd number whereas 50 is an even number.)
44 and 11
Yes: 0, 1 and 1.4 is one possible triple.
(pi - 1) and (2 - pi) Sum = (pi - 1 + 2 - pi) = 1