Question

The keyboard of a piano is made up of octaves with 5 black keys in each octave and one extra black key. There are 36 black keys on a piano. How many full octaves are there on a piano?

Answer 1

Hi there.

Let number of octaves be X.

Equation :

7x+1=36

7x=36-1

7x=35

X= 35/7

X= 5.

Therefore there are 5 number of black keys in an octave.

Hope it helps u.

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