15.5
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you would subtract 4 from 11.5 because 11.5 + -4 is the same as 11.5 - 4 (then you can check the answer on a calculator if you want)
23*5 = 115 So pick any four numbers: integers, fractions, irrational numbers, whatever. Add them together to give a sum S. Let the 5th number be 115 - S Then: sum of all five numbers = (sum of the first four numbers) + (the fifth number) = S + (115 - S) = 115 And the count of numbers = 5 So mean = Sum/Count = 115/5 = 23
There are 115 of them.
The perimeter of a square with side 115 = 115 X 4 = 460.
the sum of eight is 4+4
(4 - 3) x 10 x 12 - 5 = 115.