To simplify, see what numbers you can divide both by, which would work with 4 (: S, divide 8 and 14 by 4, whic you then get 2, and 3. So youre answer would be 2/3 (: I hope you find this useful, and good luck! :P
The percent of boys in the class is 40% because 16 + 24 = 40 (the entire amount of kids) 16 / 40 = .4 then move decimal twice to the right for percentage which gives you 40%