Respuesta :

pingwin09
Let w = white and b = black.
Using the proportion,
13/w = 9/b
Since w = 52 white keys, therefore
13/52 = 9/b
b = 36 black keys
✡ Answer: 9/36 ✡

- - Why?

Because if you look at it like this:

[tex] \frac{13}{52} = \frac{9}{36} [/tex]

- 52 being the white and 36 because the black.

✡Hope this helps✡

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