Jen has more than 50 but less than 60 chocolate bars. If she puts them equally into packets of 6, she would be short of 3 chocolate bars. If she puts them equally into packets of 7, she would have 2 extra chocolate bars. How many chocolate bars does Jen have?
Multiples of 6: 42, 48, 54, 60, 66
Multiples of 6 (-3): 39, 45, 51, 57, 63
Multiples of 7: 42, 49, 56, 63
Multiples of 7 (+2): 44, 51, 58, 65
Common number more than 50 but less than 60: 51
Number of chocolate bars that Jen has = 51
Answer(s): 51