Question

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) 20
b) 80
c) 100
d) 200
e) None of these

Answer 1

Answer: Option C

Explanation:

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.

Answer 2

Correct option is C

100


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