The Ratio of boys to gipls in the \( 6^{\text {th }} \) grade is 3 to 4 If there are 39 boys in the 6 th grade, how many girls are there?

The ratio of boys to girls in the 6th grade is given as 3 to 4. This means that for every 3 boys, there are 4 girls. Let the number of boys be represented as \( 3x \) and the number of girls as \( 4x \), where \( x \) is a common multiplier. According to the problem, there are 39 boys in the 6th grade. Therefore, we can set up the equation: \[ 3x = 39 \] To find \( x \), we divide both sides by 3: \[ x = \frac{39}{3} = 13 \] Now, we can find the number of girls by substituting \( x \) back into the expression for girls: \[ 4x = 4 \times 13 = 52 \] Thus, the number of girls in the 6th grade is \( \boxed{52} \).