Question

In a test (+4) marks are given for every correct answer and (-2) marks are given for every

incorrect answer.
Lahari answered all the questions and scored 20 marks though she got 10

correct answers. Find no. of incorrect answers of the questions she attempted.​

Answer 1

Answer:

lahari answered 10 questions incorrectly

Step-by-step explanation:

no. of correct answers lahari answered = 10

no. of marks lahari received for her correct answers= 10*4 =40

let the marks scored for her incorrect answers = x

let the no. of incorrectly answered questions= y

so, her total marks should be 40 but she scored 20 marks I. e, 40-x=20 x=20

from the question

2y=x

2y=20

x=20/2=10

lahari answered 10 questions incorrectly

I hope my answer helps you☺☺