You left out "the question cannot be answered because it is nonsense". -40 and -81 WHAT? The only sense in which the question makes ... sense, is if you're talking about electrical charges; there, -40 and -81 don't make a great deal of sense, but since they're both negative two objects with these charges would repel each other.
40/81 is in its simplest form.
-81
40
The greatest common factor of 40 , 81 = 1
0.0247
There are infinitely many different choices of 3 numbers that add up to 81. 50 + 30 + 1 = 81 40 + 40 + 1 = 81 10 + 11 + 60 = 81 etc.
81/120 = 27/40
40.0617
32.4
3,240
Negative 9 times 9= Negative 81
Two goes into eighty-one 40.5 times.