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Answer: 3.5 hours
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Given:
Find:
Solution: Looking at the question we can see that Ashley and 4 of her friends are preparing these bags which means that 5 people are going to be working on it. If we have 1575 bags, then we can just divide 5 from it to split the work evenly which gives us 315 bags per person.
Now that we know the fair share of work, we can multiply 315 bags by 2/3 of a minute per bag which gives us 210 total minutes. We can then divide that by 60 minutes per hours to get the final answer of 3.5 hours to prepare 1575 bags of samples.