First find how many kids from Riverside High are rejected: 20% * 120 kids = <<20*.01*120=24>>24 kids

Then find how many kids from West Side High are rejected: 70% * 90 kids = <<70*.01*90=63>>63 kids

Then find how many kids from Mountaintop High are rejected: 50 kids / 2 = <<50/2=25>>25 kids

Then add the number of kids from each school to find the total number of kids: 120 kids + 90 kids + 50 kids = <<120+90+50=260>>260 kids

Then subtract all the kids who were rejected from the total number of kids to find the number who got in: 260 kids - 24 kids - 63 kids - 25 kids = <<260-24-63-25=148>>148 kids

# Answer

148
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Fern is checking IDs to get into an R-rated movie. She denied 20% of the 120 kids from Riverside High, 70% of the 90 kids from West Side High, and half the 50 kids from Mountaintop High. How many kids got into the movie?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
148
Fern is checking IDs to get into an R-rated movie. She denied 20% of the 120 kids from Riverside High, 70% of the 90 kids from West Side High, and half the 50 kids from Mountaintop High. How many kids got into the movie?
train