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Archive for November, 2013

Average deviation

Posted by Chris under MathsChallenge, Tom (18 Responds)

If a single number, m, is removed from 1, 2, 3, …, n, the average value becomes 40.75.
Find m and n.
This is pretty easy, but requires some thought.

A simple square law

Posted by Chris under MathsChallenge, Tom (10 Responds)

Completely solve n^2 + 20n + 11 = m^2 for integer m, n.
This is very easy if you use the right trick.

Math? ….. No!

Posted by ragknot under Tom (9 Responds)

Not Math?
Well, maybe a little? The Trick of Mind solution will be to “Name a specific world’s country. A while back, I asked ToM an Easy and True solution about the Colebrook-White with six different equations. A Web site for the county’s computation asked me if they could publish the solution. [...]

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