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= 2 1/4 x 2/5 : 1 5/7 = 9/4 x 2/5 : 12/7
= 9/4 x 2/5 x 7/12 = 21/40 = 1 19/40
= 18/20 : 12/7
= 18/20 x 7/12
= 126/240 : 6/6
= 21/40