Finding mid-point

Question

Hello,

The basic formula to find the mid-point is (x+y)/2 right?

This does not fit well while we find the mid-point between 1 and 100. I know it should be 50 but when I plug in the values I get 50.5

This might be the time I really need to recall my high school stuff. Hint or answer is appreciated.

Thanks.

Answer 1

It gets 50.5 because this really is the mid-point between 1 and 100.

x - 1 = 100 - x ==> x = (100+1)/2 ==> x = 50.5

50 is a mid-point or the average of 0 and 100.
x - 0 = 100 - x ==> x = 100/2 ==> x = 50

Answer 2

Yep, thanks for spotting the obvious mistake, already corrected.

Answer 3

I just read this and said to myself "i should know this". thank you two :)

just one question to Kuba - I think I didn't underatand the equation. isn't 1+x = 100 - x ==> x=99/2?