Answer:
522 1/2 revolutions
Explanation:
First convert 13 3/4 into improper fraction
13 3/4 = (13 x 4 + 3)/4 = 55/4
Since these many revolutions are made in 1 minute, to find total number of revolutions made in 38 minutes, simply multiply 55/4 x 38
==> 55/4 x 38 = (55 x 38)/4 = 2090/4
Divide by 2 both numerator and denominator
==> (2090 ÷ 2)/(4 ÷ 2) = 1045/2 = 522 1/2