How many boxes were on the shelves when he started?
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117 -57 = 60
60 boxes in 3 minutes
so 20 boxes in 1 minute
so in 2 minutes = 40 boxes
57 -40 = 17 boxes ANSWER
60 boxes in 3 minutes
so 20 boxes in 1 minute
so in 2 minutes = 40 boxes
57 -40 = 17 boxes ANSWER
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everything starts at zero....
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maybe you should write the whole problem down