SOLUTION: In a class of 30 students, there are six more boys than girls. What percentage of this class are girls?

Question 347944: In a class of 30 students, there are six more boys than girls. What percentage of this class are girls?
Answer by ovie27(16) (Show Source): You can put this solution on YOUR website!
Suppose,
x = number of girls
y = number of boys
so, x + y = 30
There are six more boys than girls, so:
y = x + 6
Plug in y into the equation:
x + (x + 6) = 30
2x +6 = 30
2x = 24
x = 12
So, there are 12 girls in the class, and there are 18 boys in the class.
Now the percentage: ( let z equal the unknown percentage)
12/30 = z/100
cross multiply:
1200 = 30z
z = 40 %
So, the percentage of girls in the class is 40 percent.
RELATED QUESTIONS
In a class of 330 students, there are 60 more girls than boys. How many girls are in the... (answered by erica65404)

If there are 30 students in a class and 12 of them are girls. What percentage of boys are (answered by TimothyLamb)

The ratio of boys to girls in a class is 3:1. There are 36 students in the class. How... (answered by ikleyn,Boreal)

The ratio of boys to girls in a class is 3:5. There are 40 students in the class. How... (answered by dkppathak)

a high school graduating class is made up of 455 students. there are 67 more girls than... (answered by josgarithmetic)

a high school graduating class is made up of 455 students. there are 67 more girls than... (answered by Cromlix)

The ratio of boys to girls in a class is 4 : 5. There are 3 more girls than boys.... (answered by ewatrrr)

In a class of 330 students, there are 60 more girls than boys. How many girls are there... (answered by DrBeeee)

In a class of 25 students, 15 are boys. What percentage are... (answered by ewatrrr)