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The fraction of the compact disks ordered by the owner of the music store that are Soft Rock is 13/28.
A fraction is a quantity that is not a whole number. In maths, a fraction usually has a numerator and a denominator. The numerator is the number above while the denominator is the number below.
1 - (1/4 + 2/7)
1 -[ (7 + 8) /28]
1 - 15/28 = 13/28