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There are 15 quarters in 3 and 3/4 because 15/4 = 3 and 3/4
three fourth (or three quarters) of 20 = 15
Three quarters of 15 is equal to 0.75 x 15 = 11.25.
15.75, 15 and 3 quarters
A fourth of an hour is 60/4=15 minutes, so three quarters of an hour would be 15x3= 45 minutes.