Aptitude - Simplification - Discussion
Discussion Forum : Simplification - General Questions (Q.No. 2)
2.
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:
Answer: Option
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.
Discussion:
75 comments Page 4 of 8.
Vinshashee said:
1 decade ago
When 20 students sent from B to A,
Then A become twice then of B.
Thats The Reason We take 2 in the second step.
Then A become twice then of B.
Thats The Reason We take 2 in the second step.
Jayashri said:
5 years ago
I disagree, if A is double the number of B.
How can 100 be the answer?
As B is 60 if we double it we get 160.
How can 100 be the answer?
As B is 60 if we double it we get 160.
(5)
Sundar said:
1 decade ago
Assume x,y
x-a, y-b
10 students from b-a. So x-b,then y+b
Now doubled
2(y-20) then both equation solved.
x-a, y-b
10 students from b-a. So x-b,then y+b
Now doubled
2(y-20) then both equation solved.
Rama said:
1 decade ago
If you don't mine, somebody please explain this in clear cut. First of all I can't understand the question.
JOEPAUL said:
3 years ago
Then the number of students in A is double the number of students in B. This is because 2 (y-20).
(4)
Hello said:
6 years ago
Where is Ramesh? The one who explained the previous question very simply in this same chapter.
(1)
Naveena said:
9 years ago
Friends you are doing upto x and why values. But we have to double the A also comparing to B.
Jeet dutta said:
3 years ago
By Solving (i) and (ii) we get: x = 100, y = 80.
The required answer A = 100.
The required answer A = 100.
(3)
Kavya said:
9 years ago
It is A which is double. So the equation should be 2 (x + 20) = y - 20. Right?
Prashant said:
1 decade ago
Assume maximum capacity of both side 100 and subtract 20 from it a:b = 100:80.
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