Henry and Paul collected a total of 11+24 = <<11+24=35>>35 seashells
To make a total of 59, Leo must have collected 59-35 = <<59-35=24>>24 seashells
He gave out a quarter of 24 seashells which is 24*(1/4) = <<24*(1/4)=6>>6 seashells
They are now left with 59-6 = <<59-6=53>>53 seashells
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