Question

Your local radio station is having their yearly MP3 and concert ticket giveaway.For one minute,every 5th caller will win an MP3 player and every 7th caller will win concert tickets.You were just the first caller to win both an MP3 player and concert tickets!What number caller are you

Answer 1

The concept that can be used in order to determine the order of caller that won both an MP3 player and the concert ticket is the LEAST COMMON MULTIPLE (LCM). The LCM of 5 and 7 is 35. Thus, if I was the first one to win both the MP3 and concert ticket, I am the 35th caller.