Gwen has some balls. If she packs them in packets of 5, she will have 4 extra balls. If she packs them in packets of 7, she will have 6 extra balls. What is the minimum number of balls Gwen has?
Multiples of 5: 5, 10, 15, 20, 25, 30
Multiples of 5 (+4): 9, 14, 19, 24, 29, 34
Multiples of 7: 7, 14, 21, 28
Multiples of 7 (+6): 13, 20, 27, 34
Minimum number of balls that Gwen has = 34
Answer(s): 34