18. There are two examination rooms A and B. If 10 candidates are sent from A to B, the
number of students in each room is same. If 20 candidates are sent from B to A, the
number of students in A is double the number of students in B. Find the number of students in each room
Answers & Comments
Answer:
B=80 and a=100
form two equations
a-10=b+10
and
a+20=2(b-20)
then solve