Number theoryDifficulty 2.0JuniorFind the answerUnited Kingdom
In New Threeland there are three types of coins: the 2p; the 5p; and one other. The smallest number of coins needed to make 13p is three. The smallest number of coins needed to make 19p is three. What is the value of the third type of coin?
(A) 4p (B) 6p (C) 7p (D) 9p (E) 12p
Want a route through all this instead of an archive? The track
puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.