# There are some st

Let the number of students in halls A and B are x and y, respectively.

Now, by given condition, x – 10 = y + 10

x - y = 20 …(i)

and (x + 20) = 2(y - 20)

x–2y = -60 …(ii)

On subtracting Eq. (ii) from Eq. (i), we get

(x - y) - (x -2y) = 80

y = 80

On putting y = 80 in Eq. (i), we get

x – 80 = 20

so, x = 100

Hence, 100 students are in hall A and 80 students are in hall B.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos  Introduction to Linear Equations in Two Variables62 mins  Revision on Substitution and Elimination Method44 mins  Revision on Word Problems - 150 mins  Revision on Word Problems - 235 mins  Pair of Linear Equations-Yahaan se laye marks57 mins  Resistors in Series33 mins  Steps in Reproduction43 mins  Resistors in Parallel36 mins  Magnetic Field of Circular Conductor41 mins  Electric Motor37 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation view all courses RELATED QUESTIONS :

Solve each of theRS Aggarwal - Mathematics

If 2x – 3y = 7 anRD Sharma - Mathematics

Solve the followiRD Sharma - Mathematics