The mass of 25 parcel is 20kg and the mass of 24th parcel is 19 kg.what is the mass of 25th parcel
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Total weight 12 parcels = 12 × 1.8 = 21.6 kg. when addition of another new parcel reduces the average weight by 50 g. ∴ New average of 13 parcels = 1.8 – 0.05 = 1.75 kg.
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