two types of tickets on planet X31
Source: IV May Olympiad (Olimpiada de Mayo) 1998 L2 P5
September 17, 2022
number theory
Problem Statement
On planet there are only two types of tickets, however the system is not so bad because there are only fifteen full prices that cannot be paid exactly (you pay more and receive change). If is one of those prices that cannot be paid exactly, find the value of each type of bill.