Depends on what "units" you're talking about.
Could be +5 and -5, +5/2 and -5/2, +5/6 and -5/6, etc.
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The two digit numbers in which the tens digit is five greater than the units digit are:5061728394The number we are looking for is ten times the sum of its digits, and so must be a multiple of 10. The only one of the above numbers which fits this is 50, as 5 is five greater than 0, and 50 = 10 x (5+0).
The units digit of 159*445*7762*39 is the units digit of the product of the units digits of the four numbers, that is, the units digit of 9*5*2*9 Since there is a 5 and a 2 in that, the units digit is 0.
There are 5 of them.
There are infinitely many options. Two simple ones are:the addition of 0 and -5, andthe multiplication of 1 and -5.