If table C had $20 more than table A, then table C had $20+$40=$<<20+40=60>>60
Roulette tables A and C had $60+$40=$<<60+40=100>>100
Table B had twice as much money on it as table C, meaning table B had $60*2=$<<60*2=120>>120
Together, the three roulette tables had $120+$100=$<<120+100=220>>220
#### 220