C785 Truth or False Conjecture.
"The rules are as follows. There are nine coins here. Two of them are printed with the words 'real' and 'false.'"
"You can bet on the real coin and the fake coin respectively. Then, you can decide the winner by the number of bets and the number of coins."
"For example, Wu Hui bets 20 on the real coin and 15 on the fake coin. Du Ziming bets 10 on the real coin and 10 on the fake coin