Question

32. There are two examinations rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 candidates are sent from B to A, then the number of students in A is double the number of students in B. The number of students in room A is:

• A. (a) 20
• B. (b) 80
• C. (c) 100
• D. (d) 200

Answer 1

The correct option is C

(c) 100

Ans:32) (c)

Let the number of students in rooms A and B be x and y respectively.

Then, x - 10 = y + 10 x - y = 20.... (i)

and x + 20 = 2(y - 20) x - 2y = -60 .... (ii)

Solving (i) and (ii) we get: x = 100, y = 80.

The required answer A = 100