Find the four-digit number in which the first digit is one-fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3.
The ages of a father and son add up to 66. The father's age is the son's age reversed. How old could they be?
51 and 15, 24 and 42, 60 and 6
If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door.
You will never reach the door, it will always be half the distance, no matter how small!