There are 90 girls and 60 boys in the sixth grade at a middle school. Of these students, 19 girls and 11 boys write left-handed. What percentage of the sixth graders at this middle school write left-handed?

The percentage of left-handed 6th graders is 20%.

Step-by-step explanation:

To find this, start by finding the total number of lefties.

19 girls + 11 boys = 30 students.

Next find the total number of students

90 girls + 60 boys = 150 students

Now divide the lefties by the total number.

30/150 = 20%