Posted by Al on Saturday, April 21, 2012 at 5:29am.
Class A has the same number of students as Class B. The ratio of the number of girls in Class A to the number of girls in Class B is 3 : 2. The ratio of the number of boys in Class A to the number of boys in Class B is 3 : 5. What is the ratio of the number of girls to boys in Class B?

math  Reiny, Saturday, April 21, 2012 at 8:31am
Make a simple chart
....class A......class B
boys .. girls...boys .. girls
3y ...... 3x.......5y .... 2x
we know 3y+3x = 5y+2x
x = 2y
ration of girls to boys in class B
= 2x : 5y
= 2(2y) : 5y
= 4 : 5
There is no unique solution , just pick any value for y
e.g. using y = 5, then x = 10 (from x = 2y)
in the chart:
15.. 30....... 25 .. 20 satisfies the condition
y = 8, then x = 16
24 .. 48 ..... 40 .. 32 satisfies the condition
etc.
Answer This Question
Related Questions
 Math  The ratio of the number of boys to the number of girls in Mr. Brown's ...
 algebra  Classes A and B have 35 students each. If seven girls shift from class...
 algebra  Classes A and B have 35 students each. If seven girls shift from class...
 MATHS  Class A and Class B have the same number of pupils. The ratio of the ...
 Math  The ratio of boys to girls in a math class is 5 to 3. When 3 girls and 1...
 maths  In a class, there are 12 girls and 14boys. Express in its simplest form...
 Math  In Class A there are 80 the Boy to Girl ratio is 3 to 5. In Class B the ...
 Maths  the ratio of the number of boys to the number of girls in a class is 4:7...
 Maths  There are 36 pupils in a class. Each girl is given 8 books and each boy ...
 Math  5/8 of the students in my class were boys. When 6 girls joined the class...
More Related Questions