Who Makes It Has No Need For It
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is.
What is it?
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is.
What is it?
Last winter I found myself locked out of my house because I couldn’t remember the 5 digits code to open the garage door. I used the following facts to get inside.
1. The second and third digits add up to 9.
2. The first digit is equal to the second digit cubed.
3. The sum of the third and fifth digits is the smallest number with exactly five divisors.
4. The fourth digit is equal to 6 times the secondtolast digit.
5. None of the digits repeat.
What was the code?
Ah! Click here to read the solution.  SelectShow 

The code is “82709” If we label each digit a, b, c, d and e, we get the following equations.
