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# Question about fundamental algebra rules

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Intern
Joined: 11 Oct 2006
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10 Sep 2007, 09:51
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Quick Question regarding a simple algebra problem

"Given that A+B/B = 21, What is A/B?"

in the explanation, it just does the math saying:

1. "A+B/B = 21"

2. "A/B + 1 = 21" therefore A/B = 20

My question is with A/B+1 = 21.

Where does the +1 come from? I know this is problably extremely elementary, but I'm having a mental block. Please provide step by step. thanks in advance!
Manager
Joined: 29 Aug 2007
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10 Sep 2007, 10:02
Ok,

Just look at it this way

( A + B) / B = 21

what is ( A/ B) ?

The equation can be further written as

( A/ B ) + ( B / B) = 21 , Since B is the common denominator

( A/ B ) + 1= 21

( A/ B) = 20
Manager
Joined: 16 Feb 2007
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10 Sep 2007, 10:03
boggin wrote:
Quick Question regarding a simple algebra problem

"Given that A+B/B = 21, What is A/B?"

in the explanation, it just does the math saying:

1. "A+B/B = 21"

2. "A/B + 1 = 21" therefore A/B = 20

My question is with A/B+1 = 21.

Where does the +1 come from? I know this is problably extremely elementary, but I'm having a mental block. Please provide step by step. thanks in advance!

well the way you wrote it down is not quite correct, you should have put brackets around A+B i.e. (A+B) / B

next you just divide both terms (A and B) by B which yields A/B + B/B =21; since B/B is 1 you are left with A/B + 1 = 21 and thus A/B = 20
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