Required Mathematical Intelligence

Chapter 39 Immortal Vola Ticket
The Isle of Less Perfect is moving fast.Their leaders became increasingly interested in the ways of the outside world, especially the island's tendency to modernize its economy.Each tribe has a finance minister (the three tribes are: the Poka who always tell the truth, the Yaotai who never tell the truth, and the truth, lie or lie, and truth alternately Sirisara).The treasury ministers of the three tribes saw the need for a monetary system.The currency they will use will be Bran, Wola, and Munds (which do not necessarily correspond to the order of the tribes above).It was more difficult to determine the conversion rate of the three kinds of tickets, but in the end they came to an agreement (the value of each ticket was different).

The three ministers (A, B, C, not necessarily corresponding to the order above) made the following statements to the press according to the characteristics of their respective tribes:

A: (1) Two Walla tickets are worth five Munds tickets. (2) Our currency is Bran Tickets. (3) The currency of the Yao Tai Clan is Wola Tickets.

B: (1) A is a broken card. (2) Three Muntz tickets are worth four Bran tickets. (3) The currency of the Xili Salar tribe is more valuable than that of the Yaotai.

C: (1) B's currency is not as valuable as A's currency. (2) One Bran ticket is worth three Wola tickets. (3) Our currency is Wola Tickets.

Find which tribe A, B, and C belong to, the name of the currency used by each tribe, and the mutual exchange rate of these three currencies.

[Answer: First assume that a sentence is wrong, and then infer other people to see if it is contradictory (if there is a contradiction, change the assumption).

A demon too, Munds ticket. B Sealy Sarah, Bran vote. C broken card, Wola ticket.

Exchange rate: 3 Munds tickets = 4 Bran tickets = 12 Walla tickets. ]
(End of this chapter)