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The number of keys on an accordion is highly variable. A typical accordion like the stradella has 120 keys in 3 rows. The smallest accordion ever made had 31 keys and the largest had 405 keys.
3/4 divided by 3/5 = 5/4
(1/2) / (1/3) = 3/2 = 11/2, which is not a proper fraction.
No. 2/3 divided by 3/5 = 10/9
The proper factor of 21 is 1, 3 and 7