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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