Question

our school has 40% girls if the number of boys in the school is 180how many girls are there in the school if in the next year 10 girls and 6 boys leave the school while 15 new girls and 21 new boysjoin the school what will be the new percentage of girls and boys in the school​

Answer 1

(6n - 20)/(2n + 20) = 5/3

You get n = 20

Boys at school A after transfer = 6*20 - 20 = 100

Boys are school B after transfer = 2*20 + 20 = 60

Difference = 40

answer is 40