Kevin Langdon Omni IQ test
A certain country manufactures coins in eight integral denominations from 1 piaster to 300 piasters.
The ratios between adjacent denominations are all either 2, 2½
or 3. To purchase a 69-piaster souvenir, a tourist gives the seller one coin
and receives one coin in exchange.
Which of the following is true?
A. There are both 5-piaster and 30-piaster coins.
B. There is a 5-piaster coin but no 30-piaster coin.
C. There is a 30-piaster coin but no 5-piaster coin.
D. There is neither a 5-piaster coin nor a 30-piaster coin.
E. None of the alternatives above can be positively established from the information given.