Question

pls answer me first by substitution or eliminations method​

Answer 1

Step-by-step explanation:

let no of eight answered questions be x and wrong answered questions be y

40=3x-y

50= 4x - 2y

2x -y=25

-3x+y= -40

-x= -15

x=15

y= 5

therefore total questions=x+y =20 ans