keno questions

First thanks for all the information on the odds in gambling, I am sure you must like math to complete such a ongoing task. My question is how to figure the odds on 4 card keno I know I read a artical that it has the same as the cave man about 91% is this right. I play in tunica and the payout on 4 card with 2 coins bet is as follows 5 numbers hit 60 coins at Hollywood-70 at sams town I know that the sams towns is better but I play in vicksburg and its even different their. Hollywood last year dropped their payout when they had a mang change> I was showing my son how to play and he hit a 7 spot with two coins in which paid 700.00 (nickles) now the same bet is 500.00 quite a drop. The Multi card is all 68 coins with1 coin bet, for a 5 out of 6. I know you dont like keno and I used to play blackjack but couldnt bet, and then vp both which i play fair (have had 5 royals deal to me- I played a lot) but I retired and with keno I can take $200. drive to the casino and eat and play all day some times. thanks for you help and support.