SOLUTION: This equation I have been stuck on it for three days now and can not seem to get past it: 5-a/b ------ 15/b My answers for solutions are A) 5b - 1 ----------- 15

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Question 26386: This equation I have been stuck on it for three days now and can not seem to get past it:
5-a/b
------
15/b
My answers for solutions are
A) 5b - 1
-----------
15
B) 5b - a
----------
15
C) 5-a
--------
15
D) b-a
--------
3
This is a division problem that is why I put the lines there. I believe I would divide the 15 by 5 = 3. Then I think I would also divide the b by the b which would eliminate the b.
So I would have gotten this for an answer:
5 - a
--------
3
But this is not an answer on the test as you can see. Where am I going wrong with this problem? Thank you so much for your help!
Answer by Earlsdon(6103) About Me  (Show Source):
You can put this solution on YOUR website!
First of all, this "equation" is an "expression" and I expect the directions are to..."simplify this expression"
%285-%28a%2Fb%29%29%2F%2815%2Fb%29 First, simplify the numerator.
%28%285b-a%29%2Fb%29%2F%2815%2Fb%29 Now divide the numerator by the denominator by changing the sign to multiply and inverting the denominator.
%28%285b-a%29%2Fb%29%28b%2F15%29 Now cancel the b's
%285b-a%29%2F15 ...and there you have it!