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lolsweetcupcake
lolsweetcupcake lolsweetcupcake
  • 06-01-2016
  • Mathematics
Answered

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?

Verified Answer :

pingwin09
pingwin09 pingwin09
  • 06-01-2016

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 Link
Anonymous Anonymous
  • 06-01-2016

✡ Answer: 9/36 ✡

- - Why?

Because if you look at it like this:

\(\frac{13}{52} = \frac{9}{36}\)

- 52 being the white and 36 because the black.

✡Hope this helps✡



Answer Link

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