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Here is a keyboard of a harmonium.

What is the ratio of black keys to all keys on the given keyboard?

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7 : 17

7 : 10

17 : 7

10 : 7

answer is A.

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Detailed Solution

Given a keyboard of a harmonium.
We need to find the ratio of black keys to all the keys on the keyboard.
Observe from the given figure that,
Black keys = 7 and Total keys = White keys + black keys.
Total keys = 10 + 7
Total keys= 17
Ratio will be,

\frac{black keys}{total keys} = \frac{7}{17}

Hence, the ratio is 7:17.
Hence, the correct option is 1.

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