There are 400 persons at a fair. 5/12 of them are adults. If there are twice the number of girls than boys how many boys are at the fair?

Answer 1

7/12 x 400 = b+g = b+2b = 3b

boys = 2800/36 = 700/9 = 77 7/9 = about 78 boys

girls = 2b = 155 5/9 = about 156 girls

or maybe 77 boys 155 girls and 1 transsexual/adult like child