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On a piano, the ratio of black keys to white keys is 9 to 13, if there are 88 keys on a piano how many are black?

On a piano, the ratio of black keys to white keys is 9 to 13, if there are 88 keys on a piano how many are black?
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1 vote
On a piano, the ratio of black keys to white keys is 9 to 13, if there are 88 keys on a piano how many are black?

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User JossFD
by
7.7k points

1 Answer

3 votes

Answer:

36 black keys

Explanation:

9(88-x)=13x

792-9x=13x

792=22x

x=36

Hope this helps: )

answered
User Magico
by
8.2k points
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