21: The faulty odometer [***]
September 04, 2016
A faulty car odometer proceeds from digit 3 to digit 5, always skipping the digit
4, regardless of position. For example, after traveling one mile the odometer
changed from 000039 to 000050. If the odometer now reads 001729, how many
miles has the car actually traveled?
Spiciness: *** out of ****