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Verified answer
1,8 kg + 3¼ kg=18/10 kg + 13/4 kg
=36/20 kg + 65/20kg
=101/20kg
= 5 1/20 kg
31/4 x 100/80
3100/320
9,6 + 31/4
=9,6 + 7,7
=16,13 kg