Problem that has been haunting me!

closed account (ETAkoG1T)
Can someone explain to me the mathematical principles behind solving this problem? http://orac.amt.edu.au/cgi-bin/train/problem.pl?problemid=688&set=aio13int

Has been keeping me up at night, how does this work. I assume it would be possible to solve using simultaneous equations, can't figure out how to turn it into equations though...
Last edited on
¿didn't we discuss this already?
http://www.cplusplus.com/forum/lounge/123802/
closed account (ETAkoG1T)
I just need a more indepth explanation to understand how to apply that information.
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