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forum.virtualchallengemeets.com • View topic - Math problem - easy but hard - at least for me

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Math problem - easy but hard - at least for me

What could be so hard. It's a multiple-choice test for Pete's sake.
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Math problem - easy but hard - at least for me

Postby 101dalmatians » Sun Sep 23, 2012 12:05 pm

I have these questions that look like this:

"One pipe fills a tank in 5 hours. The other one takes 13 hours to do the same job. How much time will it take for both the pipes together to fill up one whole tank?"

Thank you.
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Re: Math problem - easy but hard - at least for me

Postby darksaber21 » Sun Sep 23, 2012 1:28 pm

This is a rate problem, involving an addition of rates.

So, let's say that the first pipe does one job per 5 hours and the second pipe to do 1 job per 13 hours. The sum of that equals one job over t, which is the formula for rate. So now we just solve for t:

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]
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