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?

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) (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.
RELATED QUESTIONS
A group of eight white piano keys makes one octave. To find the complete number of... (answered by neatmath)

Would you pls help me with this problem? There are 52 white keys & 36 black keys on a... (answered by ewatrrr)

In a bag of keys, there are 15 silver keys, 5 black keys, 10 copper keys, and 4 painted... (answered by stanbon)

In a bag of keys, there are 14 silver keys, 5 black keys, 11 copper keys, and 3 painted... (answered by Edwin McCravy)

1. In a bag of keys, there are 14 silver keys, 5 black keys, 11 copper keys, and 3... (answered by Boreal)

A standard piano keyboard has 88 different keys. Find the probability that a cat, jumping (answered by ikleyn)

There are 88 keys on a new piano. If there are 12 pianos in a room of broken pianos, some (answered by JBarnum)

A parent sets up a recording device linked to a computer to figure out what keys are hit... (answered by CPhill)

A calculator has 10 number keys and 5 operation keys. a)if one key is pressed at random, (answered by Boreal)