Chess-o-mania !!!Math brain teasers require computations to solve.
In a chess tournament conducted by the Romankachi World Chess Federation, every person played one game with every other person in the group. The total number of games that men played between themselves exceeded those played by men with women by 18. If there were 4 women on the tournament, totally how many games were played in the tournament?
AnswerTotally 120 games were played in the tournament.
Let N be the number of men in the tournament.
Then the number of games played by men between themselves
The number of games played by men with women
(since there were 4 women in the tournament)
It is given that the total number of games that men played between themselves exceeded those played by men with women by 18.
N*(N-1)/2 - 4*N = 18
N*(N-1) - 8*N = 36
N*N - N - 8*N = 36
N^2 - 9*N - 36 = 0
Factorizing we get,
N^2 - 12*N + 3*N - 36 = 0
N*(N - 12) + 3*(N - 12) = 0
(N - 12)(N + 3) = 0
Hence N = 12 or -3 (not possible).
Hence the number of men in the chess tournament
= N = 12
Therefore the total number of people participating in the chess tournament = 12 + 4 = 16.
The total number of games played in the tournament
See another brain teaser just like this one...
Or, just get a random brain teaser
If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.
Back to Top