If a 4th grade with 140 students has 3 boys for every 4 girls how many are girls? how many are boys?

Set up a proportion and cross multiply. Let x = the number of boys

3/7 = x/140
7x = 420
x = 60

try (20*4)+(20*3)

there are 80 fourth graders in school of these, 35 were boys. what fractional part of the fourth graders were girls

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To determine the number of boys and girls in a 4th-grade class with 140 students and a ratio of 3 boys to 4 girls, we need to follow these steps:

Step 1: Calculate the total number of parts in the ratio.
The ratio of boys to girls is 3:4, which means there are a total of 3 + 4 = 7 parts.

Step 2: Determine the value of each part.
To calculate the value of each part, divide the total number of students (140) by the total number of parts (7):
140 / 7 = 20

Step 3: Calculate the number of boys.
Multiply the number of parts for boys (3) by the value of each part (20):
3 x 20 = 60

Therefore, there are 60 boys in the 4th-grade class.

Step 4: Calculate the number of girls.
Multiply the number of parts for girls (4) by the value of each part (20):
4 x 20 = 80

Therefore, there are 80 girls in the 4th-grade class.