# 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* - 2*y* = -60 .... (ii)

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

The required answer A = 100.

Discussion:

74 comments Page 8 of 8.
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.

Doss said:
1 decade ago

Dear friend explain with example.........

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