Let the two numbers be x and y since their sum is 16 x+y=16 since their difference is 20 x-y=20 so since x+y=16 x=16-y and now plug this in below 16-y-y=20 and 16-2y=20 -2y=4 y=-2 and x-2=16 so x=18 the numbers are 18 and -2
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7 & 9
11 and 5
16 and 35
10 and 6
15 + 1 = 16 sum 15 - 1 = 14 difference