At a party, every 2nd guest gets a mug, every 6th guest gets a thumbdrive and every 9th guest gets a wallet. What is the position of the first guest that will get all three gifts?
Multiples of 2: 2, 4, 6, 8, 10, 12, 14, 16, 18
Multiples of 6: 6, 12, 18
Multiples of 9: 9, 18
Position of first guest that receives all 3 gifts
= Lowest common multiple of 2, 6, 9
= 18
Answer(s): 18