I guess you mean: What number when you subtract 20, gives 40 as the answer?x - 20 = 40.Add 20 to both sides: x - 20 + 20 = 40 + 20x = 60
40
82 subtract by 20 = 62
64
say you have 7/5 and 8/4. to subtract them, all you have to do is give them a common denominator (the number on the bottem) the lowest commen denominator (LCM) is 20 to get both of them with a denominator of 20 multiply by 4/4 and 5/5 respectivly. 7/5 x 4/4 = 28/20 8/4 x 5/5 = 40/20 then subtract. 40/20 - 28/20 = 12/20
Subtract a negative 1. 19 - (-1) = 20
7 times 6 is 42. If you subtract two, you get 42-2= 40.
28
30
55
-32915 is what you get when you subtract 825 from 33740.
60