SOLUTION: The keyboard of a piano has seven full octaves plus two extra white keys and one extra black key. There are 36 black keys on a piano. How many black keys are there in one octave?

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: The keyboard of a piano has seven full octaves plus two extra white keys and one extra black key. There are 36 black keys on a piano. How many black keys are there in one octave?       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 119615: The keyboard of a piano has seven full octaves plus two extra white keys and one extra black key. There are 36 black keys on a piano. How many black keys are there in one octave?
I tried this I don't think I'm right (need help)
7x=36-1
7x=35
x=5
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
The keyboard of a piano has seven full octaves plus two extra white keys and one extra black key. There are 36 black keys on a piano. How many black keys are there in one octave?
---------------------------------
Let number of black in an octave be "x"
---------------------
EQUATIONS:
7x+1 = 36
7x = 35
x = 5 (Number of black keys in an octave)
----------
Cheers,
Stan H.