Question 612401
Girls + Boys = Class or g + b = c
Given information: c=28 and g=2b-5 
Plug in given information into g+b=c, (2b-5)+ b = 28, 3b-5 = 28, 3b=33, b=11
Finish, boys=11, girls= 2x11-5, girls=17

Check: b+g=c, 11+17=28