Anna_03 - 19.01.2016 19:07There are 15 boys and 9 girls in your gym class. If 5 boys joined the class, how many girls would need to join for the ratio of boys to girls to remain

Patrick Ogden - 19.01.2016 19:22Number of boys in the gym class = 15 Number of girls in the gym class = 9 then Ratio of boys to ratio of girls = 15:9 or 5:3 Now Number of boys joining the gym class later = 5 So after the new boys join the number of boys in the gym class becomes = 20 The ratio of boys to girls have to remain the same Let us assume that the number of girls that need to join the gym class = x Then 5/3 = 20/(x + 9) 5(x + 0) = 3 * 20 5x + 45 = 60 5x = 60 - 45 5x = 15 x = 15/5 =3 So the number of girls that need to join the gym class to keep the ratio same is 3. I hope the procedure for finding the solution is easy enough for you to understand.