Answer:
There are 102 girls and 136 boys and 238 juniors
Explanation:
girls: boys: total
3 4 7
Multiply by x
3x 4x 7x
The ratio has to stay the same
We have 238 juniors. That is our total
238 = 7x
Divide by 7
238/7 =7x/x
34 =x
Now we can figure out how many girls and boys since we know x
girls: boys: total
3x 4x 7x
3(34) 4(34) 238
102 136 238
There are 102 girls and 136 boys and 238 juniors