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b. 99/20
c. 23/7
4.a. 25/49
b. 64/81
a. 13/4 : 3/4 = 13/4 x 4/3 = 52/3 = 17 1/3
b. 11/2 x 8/4 = 11
c. 7/5 x 5/2 x 23/7 = 46
4.
a. 25/49
b. 216/729 = 64/81