The numbers are 133 and 54
The two numbers which add to 5 and their difference is 11 are:-3 + (-8) = 5
The numbers are: 76 and 20
62.5 and 37.5
9 & 23
It is 21 and 9. Because you halve 30 to get 15, then add 6 to each to get the difference.
187
If i understand correctly, 2 numbers add to 115 and these 2 numbers have a difference of 45. If so 80 and 35
1 x 187 11 x 17
8 and 12
120 + 138
38 and 25
GCF(187, 399) = 1, the two numbers are coprime.