(Got this from my facebook news feed.)
A friend of mine, upset after the earlier housing number conundrum, decided to make me guess his. He said:
- If my house number is a multiple of 3, it's from 50 to 59.
- If it is not a multiple of 4, then it is a number from 60 to 69.
- If it is not a multiple of 6, then it is a number from 70 to 79.
What's the house number?