The answer depends entire on what R is meant to be.
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The mixed fraction PQ/R = (P*R + Q)/R
To find the reciprocal of a non-zero fraction, simply swap the numerator and the denominator. So R(2/3) = 3/2 : where R() stands for "the reciprocal of" ... whatever is in the brackets. Remember that 12 = 12/1 so R(12) = R(12/1) = 1/12. If you have a mixed fraction then there is one additional step you need to do first and that is to convert it to an improper (or top-heavy) fraction. So R(23/4) = R(11/4) = 4/11
15 and 24, respectively.
54/200
Suppose you have a fraction in the form a/b where a and b are integers and b > 0. Since the fraction is improper, a must be greater than b. Divide a ÷ b. Suppose b goes into a k times and leaves a remainder of r. Then a/b = k r/b