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= 1/20 + 1/15 - 11/12
=3/60 + 4/60 - 55/60
= - 48/60
= - 8/10 atau - 4/5
=======> B
= 7/10 x 2/3 : 12/25
= 14/30 x 25/12
=350/360
=35/36