Posted by Bella bell on Monday, January 9, 2012 at 12:58am.
<<Which five consecutive numbers equals 175?>>
The average is 175/5 = 35, and that must be the "middle" number.
Since they are consecutive integers, they are 33, 34, 35, 36 and 37
You must have copied the last question incorrectly, unless there are a lot on one-legged cows and ducks
Consider one of the points. If there are n points, you can draw n-1 lines from that point to the others.
By the time you have drawn all lines from n points, you have drawn n(n-1) lines. But each line is drawn twice. The line from point 6 to point 3 is the same line as was already drawn from point 3 to point 6.
There are thus n(n-1)/2 lines.
For this problem, n=15.
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