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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?
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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?
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Jul 13, 2017
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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?
Mathematics
high-school
Tobias Windisch
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Tobias Windisch
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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
Lukas Novicky
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Jul 14, 2017
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Lukas Novicky
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4
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✡
Answer: 9/36
✡
- - Why?
Because if you look at it like this:
- 52 being the white and 36 because the black.
✡Hope this helps
✡
Cello
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Jul 19, 2017
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Cello
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