Answer :

According to the given figure,

(a) The total number of black keys = 7

The total number of white keys = 10

Hence, the ratio of white keys to black keys on the keyboard =

(b) The total number of all keys = 10 + 7 = 17

The ratio of black keys to all keys on the given keyboard =

(c) Black keys in 1 keyboard = 7

Black keys in 14 such keyboards = 14× 7 = 98 keys.

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