There are 75 students in a classes A and B altogether. There are 61 students in classes A and C altogether. The ratio of the number of students in Class B to Class C is 5:3. How many students are there in Class A?
+66 A+B=75
A+C=61
C*1.6666=B
A=61-C
A=75-C*1.666666
61-C=75-C*1.6666
C=21
B=35
A=40
There are 40 students in Class A
