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 6 of 8.
Basheerbi said:
1 decade ago
I can't understand the prasu explanation tell me clearly.
Prasu said:
1 decade ago
Based on the answer a=100 and b=80. They said that if 20 sent from a to b then.
A will become double of b.
So if 20 sent then a=120 and b=60 i.e. a is double of b.
A will become double of b.
So if 20 sent then a=120 and b=60 i.e. a is double of b.
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.
Mmmm said:
1 decade ago
Tell me clearly. Please.
Akilapriya said:
1 decade ago
I can't understand the sentence "then the number of students in A is double the number of students in B" explain me.
Rcahana said:
1 decade ago
Please help me solve this.
PRAKASH said:
1 decade ago
I don't know how 2 was came at step 2.
Please explain.
Please explain.
Idhaa said:
10 years ago
2 has come because there are two rooms in the question.
Doss said:
1 decade ago
Dear friend explain with example.........
Srividya said:
9 years ago
Friends as the question had given that A is doubled then why we doubled B? Can anyone explain this problem in another process?
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