The ratio is 4/5 girls to boys. if there are 60 girls you would divide 60 by 4 and get 15. you would then multiply that 15 by 5 to get the number of boys in the choir. your answer would be 75 because 15x5=75. there are 75 boys in the choir
The model is 1:50 so take 11/5 and multiply it by 50 and you get 110, so the window is 110 inches long
