The ratio of girls to boys is 2:1 and that there are 3 boys, what is the number of girls?

Question

The ratio of girls to boys is 2:1 and that there are 3 boys, what is the number of girls?

Answer 1

Let N be the number of students.

 

2     3

-- = ----

1      ?

 

2* ? = 3* 1

 

2* ? = 3

 

?  = 3/2 girls

 

   = 1 and 1/2 girls

 

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Think of it this way:

 

  There are three boys.  

  For 2 of those boys, there's 1 girl.

  For the remaining boy , that is 1/2 girl.

  So 1 and 1/2

 

interesting