Mr. Yang has some pens. If he ties them in bundles of 9, he will have 4 extra pens. If he ties them in bundles of 10, he would be short of 2 pens. What is the smallest possible number of pens Mr. Yang has?
Multiples of 9: 9, 18, 27, 36, 45, 54
Multiples of 9 (+4): 13, 22, 31, 40, 49, 58
Multiples of 10: 10, 20, 30, 40, 50, 60
Multiples of 10 (-2): 8, 18, 28, 38, 48, 58
Smallest possible number of pens that Mr. Yang has = 58
Answer(s): 58
