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?

asked Apr 18, 2022 118k views

1 vote

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3 votes

Answer:

36 black keys

Explanation:

9(88-x)=13x

792-9x=13x

792=22x

x=36

Hope this helps: )

Magico answered Apr 24, 2022

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