How many left-handed students are in school?

Question

The ratio of the number of right-handed students in school to the number of left- handed students in school is 9 : 1. There are 360 right-handed students in school. Left handed students?

Answer 1

R = Number of right-handed students

L = Number of left-handed students

 

Ratio of number of right-handed students to number of left-handed students = 9:1

R / L = 9/1 = 9

 

Re-arrange the above equation

R / L * L = 9 * L

R = 9L

 

360 right-handed students

R = 360

 

Substitute R in above equation.

360 = 9L

360 / 9 = 9L / 9

40 = L

 

L = 40

 

Number of left-handed students = 40