+130475 None.....to see why.....note that the only possible solution would have to lie between 7 and 8 or between 8 and 9......but, if r lies between 7 and 8, the answer will be less than 15.5, while, if r lies between 8 and 9, the answer will be greater than 15.5....
[I believe this is correct...!!!]
+23254 None.
When r = 7.999, floor(r) = 7, and their sum is 14.999.
When r = 8, floor(r) = 8, and their sum is 16.
All values of 15 are skipped.
+130475 None.....to see why.....note that the only possible solution would have to lie between 7 and 8 or between 8 and 9......but, if r lies between 7 and 8, the answer will be less than 15.5, while, if r lies between 8 and 9, the answer will be greater than 15.5....
[I believe this is correct...!!!]
