Zara has more than 60 but less than 70 mochi balls. If she puts them equally into packets of 8, she would be short of 5 mochi balls. If she puts them equally into packets of 7, she would have 4 extra mochi balls. How many mochi balls does Zara have?
Multiples of 8: 48, 56, 64, 72
Multiples of 8 (-5): 43, 51, 59, 67
Multiples of 7: 49, 56, 63, 70, 77
Multiples of 7 (+4): 53, 60, 67, 74, 81
Common number more than 60 but less than 70: 67
Number of mochi balls that Zara has = 67
Answer(s): 67