A bag contains 100 counters that are either red or green or blue.
The ratio of the numbers red counters to the number green counters in the bag is 4 : 1
One quarter of the counters are blue.
The mean mass of the red counters is 6 grams
The mean mass of the green counters is 2 grams
The mean mass of the blue counters is 4 grams
Show clearly that the mean mass of all 100 counters is less than 5 grams.
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