Mr. Neo has some files. If he ties them in bundles of 9, he will have 4 extra files. If he ties them in bundles of 10, he would be short of 3 files. What is the smallest possible number of files Mr. Neo has?
Multiples of 9: 9, 18, 27, 36, 45, 54, 63
Multiples of 9 (+4): 13, 22, 31, 40, 49, 58, 67
Multiples of 10: 10, 20, 30, 40, 50, 60, 70
Multiples of 10 (-3): 7, 17, 27, 37, 47, 57, 67
Smallest possible number of files that Mr. Neo has = 67
Answer(s): 67
