Yoko has more than 60 but less than 70 chocolate bars. If she puts them equally into packets of 7, she would be short of 5 chocolate bars. If she puts them equally into packets of 9, she would have 2 extra chocolate bars. How many chocolate bars does Yoko have?
Multiples of 7: 49, 56, 63, 70, 77
Multiples of 7 (-5): 44, 51, 58, 65, 72
Multiples of 9: 45, 54, 63, 72
Multiples of 9 (+2): 47, 56, 65, 74
Common number more than 60 but less than 70: 65
Number of chocolate bars that Yoko has = 65
Answer(s): 65