Penelope has more than 30 but less than 40 mochi balls. If she puts them equally into bags of 8, she would be short of 4 mochi balls. If she puts them equally into bags of 10, she would have 6 extra mochi balls. How many mochi balls does Penelope have?
Multiples of 8: 16, 24, 32, 40, 48
Multiples of 8 (-4): 12, 20, 28, 36, 44
Multiples of 10: 20, 30, 40, 50
Multiples of 10 (+6): 26, 36, 46, 56
Common number more than 30 but less than 40: 36
Number of mochi balls that Penelope has = 36
Answer(s): 36