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Rate Problem

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Rate Problem

by Stockmoose16 » Tue Sep 02, 2008 5:13 pm
Why doesn't the following equation work correctly for this problem:

If a copier can make 3 copies every 2 seconds, how long will it take to make 40 copies?

3/2=40/x

I get an answer of 80/3 seconds... but I think it should be 60 seconds. Why isn't the ratio method working?
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by hengirl03 » Tue Sep 02, 2008 5:24 pm
There is nothing wrong with the rate formula that you used. You got the problem right.


Maybe this will make you see that you got the correct answer:

3 copies every 2 seconds.

So that also means that 30 copies are made in 20 secs.

10 more copies are still needed. So at this same rate, it will take the copier a little more than 6 seconds to complete the job.

Which is the same answer that you got, 80/3.
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