Here is a key board of a harmonium:
This pattern of keys is repeated on larger keyboard. How many black keys would expect to find on a keyboard with $14$ such patterns.

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Solution

Black keys in $1$ keyboard $= 7$
Black keys in $14$ such keyboards $= 14 \times 7 = 98$ keys

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Question 101 (iii)

Here is keyboard of a harmonium.

This pattern of keys is repeated on a larger keyboard. How many black keys would you expect to find on a keyboard with 14 such patterns?

Question 101 (i)

Here is a keyboard for a harmonium.
Find the ratio of white key to black keys on the keyboard.

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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