What is the smallest number such that when you add 1 to it, the result is divisible by 12, 18, 24, 32, and 40?
Explanation
The least common multiple (LCM) of 12, 18, 24, 32, and 40 is 1440. Since the number plus 1 must be divisible by all these numbers, the number is 1440 minus 1, which equals 1439.