Mathematics, 25.02.2021 01:50 cschellfamily

There are 25 packets of rubbers and 5 boxes of rubbers in a delivery parcel. The mean number of rubbers in all the packets and boxes is 20. The mean number of rubbers in all packet is 18 . Work out the mean number of rubbers in the boxes.

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There are 25 packets of rubbers and 5 boxes of rubbers in a delivery parcel. The mean number of rubb...