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On his 1st 25 trips to the baths a swimmer managed to swim an average of 4 lengths each time . After a further 50 visits to the Baths his average number of lengths per visit rose to 8.
What was the swimmer's average number of lengths for the last visit only.
Please show all workings. Thanx
What was the swimmer's average number of lengths for the last visit only.
Please show all workings. Thanx
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