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Due on Feb. 07, 2009
Asked on Feb. 07, 2009 at 09:32:55AM

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Two rainstorms occurred in one week in a certain area. In the first storm 20 mL of rain fell per hour, and in the second 30mLof rain fell per hour. Rain fell that week for a toatl of 75 hours for a toral rainfall of 1850mL. How long was each storm. I know that you use x + y = 75 and 20x + 30 y = 1850. I don't know how they get the answer of

I know this is the answer because it is in the back of the book but how did they get this answer??

1st storm= 40 hr

2nd storm= 35 hr

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dashpunkz
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Posted on Feb. 07, 2009 at 09:39:18AM

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Preview: ... ion. x=75-y (from 1)substitute this in (2) ...

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gorgo20
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Posted on Feb. 07, 2009 at 09:49:22AM

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Preview: ... o solve it. Multiply the first eq by 20, the system becomes 20x + 20y = 1500 20x + ...

The full tutorial is about 71 words long .