Posted by student on Monday, December 7, 2009 at 8:28pm.
Let x = the number of girls.
Cross multiply and solve for x.
5/7 = 15/x
Add the number of boys and girls together.
15 boys is three times the number of boys originally, so there are 21 girls, meaning there is a total of 36 students.
Related Questions
math/hurry - The ratio of boys to girls in Mr. Joiner’s class is 5 to 7. If...
math - The ratio of boys to girls in Mr. Joiner’s class is 5 to 7. If there...
Math 156 - The ratio of girls to boys in Mr. Maddox's class of 20 students ...
math - Juan's class has 10 girls and 15 boys. the ratio fo girl to boys in ...
Math - Mrs.Smith's class has 12 girls and 8 boys. What percent of he class ...
Math - Write each ratio as a fraction in simplistic form. a class has 6 boys and...
5th math - Mr. davison has 30 students in his class . He has four more girls ...
math - A class of 25 students has 10 boys. Three boys have braces and 4 girls ...
Math - If the ratio of girls to boys on the swim team is 2:3, which of these ...
Maths - There are 40 pupils in a class. There are 10 more boys than girls. When ...
For Further Reading
