PRACTICE PAPER #37 – BACK-TO-BASICS n°1 – letters and numbers
– each digit must be pronounced separately.
– when the number is in whole hundreds or whole thousands.
– when using the 12-hour clock position system.
– abcd = 1349: b is 3 times a, and d is three times b, so d is 9 times a. The only possibility is a=1 and d=9.