There are 3/8 x 480 = <<3/8*480=180>>180 boys.
So, there are a total of 480 - 180 = <<480-180=300>>300 girls.
Therefore, there are 300 - 180 = <<300-180=120>>120 more girls than boys. Answer: \boxed{120}.
There are 480 children in a hall. 3 8 of them are boys. How many more girls than boys are there?
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