The ratio of boys to girls in the 7th grade at GACA is 2 to 4. If there were 850 kids in the 7th grade, how many would you expect to be girls? Round to the nearest whole number.
The total ratio is 2+4=<<2+4=6>>6.
From the total ratio, 4/6 of the kids are girls.
4/6*850=<<4/6*850=566.66666667>>566.67 girls are expected. Answer: \boxed{567}.