K=19 which would leave the equation 181=181. The first step to solving this is subtracting 9k from each side.
after you do that it should be k-9=10
now you add 9 to both sides leave k=19. plug k into the equation and get 181=181
M= 6 so 2m would be 12 and 12-3=9
20. Because the tickets must have different points of origin, only 1 ticket can be sold per stop.
I'm pretty sure that 20 is 5 but other than that, I can't help with anymore.
