At a party, every seventh guest gets a thumbdrive and every ninth guest gets a cup. What is the position of the first guest that will get both a thumbdrive and a cup?
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63
Multiples of 9: 9, 18, 27, 36, 45, 54, 63
Position of first guest that gets both a thumbdrive and cup
= Lowest common multiple of 7 and 9
= 63
Answer(s): 63