Question

In a competitive examination,one mark is awarded for each correct answer while 1
2 mark is deducted for every wrong answer. Jayanti answered 120 questions and got 90 marks. How many questions did she and correctly?

Answer 1

Hey..

Your answer...

Let correct answers=x
Incorrect answers=y

So..x-2y=90
and x+y=120

Subtracting the equations...

-3y=-30
y=10

So..x=110

So...she answered 110 answers correctly...

Thanks..✌

Answer 2

let correct question x
incorrect question 120-x

1*x- 2*(120-x) = 90
x-240+2x= 90
3x = 330
x = 110 Answer