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A piano has white keys and black keys in the ratio of 13 : 9. If there are 52 white keys,how many black keys are there?

2 Answers

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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
User Lukas Novicky
by
8.5k points
4 votes
Answer: 9/36

- - Why?

Because if you look at it like this:


(13)/(52) = (9)/(36)

- 52 being the white and 36 because the black.

✡Hope this helps



User Cello
by
8.7k points

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