Question

In a test, +3 marks are given for every correct answer and -1 mark are given for every incorrect
answer. Sona attempted all the questions and scored +20 marks though she got 10 correct
answers.
(1) How many incorrect answers has she attempted?
(ii) How many questions were given in the test?
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Answer 1

Answer:

THE ANSWER IS:

•ANS (1) 10 INCORRECT ANSWERS SONA GAVE.

•ANS (2) 20 QUESTIONS WERE GIVEN.

Step-by-step explanation:

WE SOLVE LIKE THIS:

•ANS (1) MARKS SONA GOT - 20

NUMBER OF CORRECT ANSWERS SHE GAVE - 10

= 10 x 3 = 30 MARKS SHE SHOULD HAVE GOT,

BUT SHE GOT 20.

NUMBER OF INCORRECT ANSWERS = -1 x 30 - 20

= -1 x 10

= 10 INCORRECT ANSWERS.

SO,SHE GAVE 10 INCORRECT ANSWERS.

•ANS (2) NUMBER OF CORRECT QUESTIONS + NUMBER OF INCORRECT QUESTIONS

= 10 + 10

= 20 QUESTIONS.

SO,20 QUESTIONS WERE THERE.

HOPE IT HELPS YOU.