the ratio of the number of students in class A, B and C is 3:7:8. if 10 students leave c and join b , the ratio of the number of students in b and c would be reversed. find the total number of students in classes a,b and c

Can I from a equation and solve? Please explain

3 answers

A:B:C = 3:7:8
A:B+10:C-10 = 3:8:7

That means that

b/c = 7/8
(b+10)/(c-10) = 8/7
Solving that, we have
b=70
c=80
Now, you can figure a.

180