Question

There are some students in the two examination halls a and b.to make the number equal in each hall ,10 students are sent from a to b.but if 20 students are sent from b to a the number of students in a becomes double the number of students in b.find the number of students in the two halls

Answer 1

Answer:

A = 100 and B = 80

Step-by-step explanation:

a - 10 = b + 10 and 2 (b - 20) = a + 20

Solving for a and b:

a = b + 20

So,

2 (b - 20) = a + 20

2b - 40 = a + 20

a = 2b - 60

b + 20 = 2b - 60

b = 80

And

a = b + 20

a = 80 + 20 = 100

Therefore, a = 100 and b = 80