Question

around and vinod have some erasers .arvind said to vinod , if u give me 10 erasers I will have twice the erasers left with u. represent in 2 variables

Answer 1

Let the number of erasers Arvind has be x and Vinod have be y.
Equations
2(x+10)=y-10 = 2x+20=y-10 = 2x-y=-30

Answer 2

Let the no. of eraser of Arvind be x
and the no. of eraser of vinod be y.
x = y
x - y = 0 ............ ( 1 )
2y = x + 10
x - 2y = -10 ............. ( 2 )
By solving these two equations, we obtain x = 10, y = 10
Arun and Vinod has 10 erasers.