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Let x be the number of girls in g4.
Since the number of boys is 20 more than the number of girls, the number of boys is x + 20.
The total number of students is the sum of the number of boys and girls:
x + (x + 20) = 200
2x + 20 = 200
2x = 180
x = 90
So, there are 90 girls and 110 boys in g4.
The fraction of fourth graders that are boys is:
(110 boys) / (200 total students) = 11/20
Therefore, the fraction of fourth graders that are boys is 11/20 in its simplest form.