There are far too many possibilities to list them all ! Some examples are... 1 + 39, 4 + 36, 21 +19, 35 + 5.....
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A number "m" plus 40 equals 60. Therefore, 60 minus 40 equals m. m therefore equals 20.
40
10y plus 40 equals 50y.
As a product of its prime factors: 2*2*2*5 = 40 or as 23*5 = 40
280