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Fractions and Ratios

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Question 101 (ii)

Here is a keyboard fo a harmonium.

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

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Solution

the total number of all keys $= 10 + 7 = 17$
The ratio of black keys to all keys on the given keyboard $= \frac{7}{17}$

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Fractions and Ratios

Standard VIII Mathematics

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