Simple math question

Thread Starter

tadm123

Joined Nov 20, 2013
43
In an engineering lecture I'm stuck in this part, this is one of those problems where you know it is pretty dumb but can't get out of it. Here's the link:

http://s18.postimg.org/ytzfn0wnt/equation.jpg

Can anyone explain me how they got a simplified Re/re from there?

I divided both of the numbers in that equation and got a (Re+re)/re.
How did they get rid of that "re" in the numerator and simplify it in that form?

Thanks in advance
 
Last edited:

shteii01

Joined Feb 19, 2010
4,644
\(\frac{Re+re}{re}\geq\frac{27*13}{10*14.8}\)
\(\frac{Re}{re}+\frac{re}{re}\geq\frac{351}{148}\)
\(\frac{Re}{re}+1\geq2.372\)
\(\frac{Re}{re}\geq2.372-1\)
\(\frac{Re}{re}\geq1.372\)
 

Thread Starter

tadm123

Joined Nov 20, 2013
43
I feel so stupid, of course you distribute them.

Yeah, I also get 1.372. They must had simplify the 14.8/13 which gets you 1.1 and then use that to divide it.

Anyways, thanks for the replies guys.
 
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