Sedrich has 17 + 4 = <<17+4=21>>21 jelly beans.
The sum of Napoleon and Sedrich's jelly beans is 17 + 21 = <<17+21=38>>38 jelly beans.
Twice the sum is 38 x 2 = <<38*2=76>>76 jelly beans.
Mikey has 76/4 = <<76/4=19>>19 jelly beans.
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