Railway ticket selling puzzle
Every station on the railway system sells tickets to every other station. Some new stations were added. 46 sets of additional sets of tickets were required.
How many new stations have been added?
How many stations were there originally? 
2 new stations have been added & 11 stations were there originally
Explanation-
Let,
N = Original number of stations
X= Added stations
T = # of tickets required
T= N(N-1)
T+46 = (N+X)(N+X-1)
N^2 – N + 46 = N^2+2NX+X^2-N-X
46 = X^2+2NX-X = X(X+2N-1)
Since X and N are intergers, factor 46 to get the only two integer roots 2 and 23.
2*23=X(X+2N-1) so X = 2
and 23 =(X+2N-1) or N = 11
Can you please share the calculations?
N = Original number of stations
X= Added stations
T = # of tickets required
T= N(N-1)
T+46 = (N+X)(N+X-1)
N^2 – N + 46 = N^2+2NX+X^2-N-X
46 = X^2+2NX-X = X(X+2N-1)
Since X and N are intergers, factor 46 to get the only two integer roots 2 and 23.
2*23=X(X+2N-1) so X = 2 and 23 =(X+2N-1) or N = 11
Your Answer
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