There are 200 students in g4. The number of boys is 20 more than the number of girls. What fraction of fourth graders are boys? Use the simplest form.

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.