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2014-01-27T17:47:02+01:00
a. 18/5 x 16/27 = 288/135 = 9 x 32 / 9 x 15 = 32/15

b. 56/27 x 18/35 = 1008/945 = 63 x 16 / 63 x 15 = 16/15

c. 14 x 27/21 = 378/21 = 21 x 18 / 21  1 = 18/1 = 18