Question

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
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Answer 1

Answer:

B=80 and a=100

form two equations

a-10=b+10

and

a+20=2(b-20)

then solve