There are 57 students in class of 6th and 7th graders. There are twice as many 6th graders. How many 6th graders?

divide 57 into 3 equal parts. each part is thus 19.

So, two of the parts are 6th graders: 38
The other part are 7th graders: 19

To find the number of 6th graders, we can first let's set up an equation based on the information given. Let's assume the number of 6th graders is represented by "x".

Since there are twice as many 6th graders as 7th graders, we can say that the number of 7th graders is "x/2".

The total number of students is 57, so we can write the equation:

x + x/2 = 57

To solve this equation, we can multiply through by 2 to clear the fraction:

2x + x = 114

Combining like terms, we get:

3x = 114

Now, to isolate x, the variable representing the number of 6th graders, we divide both sides of the equation by 3:

(3x)/3 = 114/3

Simplifying, we find:

x = 38

Therefore, there are 38 6th graders in the class.