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= 51/12 + 80/12 × 2/5
= 131/12 × 2/5
= 262/60
= 4 22/60
= 4 11/30
= 17/4+ 20/3× 2/5
= 17/4+ 40/15
=255/60+160/60
=415/60
=6 55/60
= 6 11/12