The ratio of the numbers of boys and girls in a school is 5 : 8. If there are 260 students in the school, then what is the difference between the numbers of girls and boys in the school?

60 

Ratio of boys and girls = 5 : 8

Total number of students = 13r = 260
                                            r = 20

Difference between boys and girls = 3r = 3 x 20 = 60