64% of the students of a class are girls and 81.25% of the girls have chosen soccer as their favourite sport. If 143 girls have chosen soccer as their favourite sport, what is the total number of students in the class?

275

64% = \(\frac{16}{25}\) 

let total number of students in class =  100x

Girls chosen soccer is 81.25% of the 64% of 100x ,

 \(\frac{16}{25}\) × \(\frac{81.25}{100}\) × 100X = 143 (Given)

100X = 275

So , Total number of students in the class = 275