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equations inequalities & Vic-chap 1

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sarbie
 Post subject: equations inequalities & Vic-chap 1
 Post Posted: Sat Oct 11, 2008 4:56 pm 
p.set- q#12

How do you know that for:
a+b[/u]b=21 that a[/u]b is 20?
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Saurav
 Post subject:
 Post Posted: Sat Oct 25, 2008 3:22 pm 
Can you please post this question again. Its lost in the formatting.
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JonathanSchneider
 Post subject:
 Post Posted: Thu Nov 13, 2008 1:22 am 
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ManhattanGMAT Staff


Posts: 380
Simply break it apart.

We start with (a+b)/b = 21.

Break this into a/b + b/b = 21
Now, see that b/b = 1.
So, we really have a/b + 1 = 21
and thus a/b = 20.
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