Class 6V and Class 6W have a total of 153 students. ¹₆ of the students in Class 6V and ⁶₁₁ of the students in Class 6W are boys. The number of girls in Class 6V is equal to the number of girls in Class 6W. Find the total number of girls in the 2 classes.
Fraction of Class 6V that are girls
= 1 - ¹₆ 
= ⁵₆

Fraction of Class 6W that are girls
= 1 - ⁶₁₁ 
= ⁵₁₁ 
 
The number of girls in Class 6V is equal to the number of girls in Class 6W.

The numerators are the same.  

⁵₆ Class 6V = ⁵₁₁ Class 6W 

Number of students in Class 6V = 6 u
Number of students in Class 6W = 11 u

Total number of students 
= 6 u + 11 u
= 17 u

17 u = 153

1 u = 153 ÷ 17 = 9

Number of girls in Class 6V =5 u
Number of girls in Class 6W =5 u

Total number of girls
= 5 u + 5 u
= 10 u
= 10 x 9
= 90

Answer(s): 90