At a party, every 2nd guest gets a wallet, every 4th guest gets a cup and every 10th guest gets a thumbdrive. 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, 20
Multiples of 4: 4, 8, 12, 16, 20
Multiples of 10: 10, 20
Position of first guest that receives all 3 gifts
= Lowest common multiple of 2, 4, 10
= 20
Answer(s): 20