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 + 20
x = 60
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A number "m" plus 40 equals 60. Therefore, 60 minus 40 equals m. m therefore equals 20.
The numbers are: -2 and -20
20 is the GCF. The LCM is 40.
Of course!
2/x =16/20 16x = 40 x = 2.5