-70
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No single number multiplies to -50 and adds to -20. There is no indication in the question as to how many numbers you are interested in.
65
Unfortunately there are no numbers that add to make 23 and multiply to make 50.25 + (-2) = 2325 x -2 = -50
To add 20 percent to a number, multiply the number by 1.2. For example, adding 20 percent to 50 gives 50 x 1.2 = 60.
The only perfect number between 20 and 50 is 28.
It is worth 50.