Question

In a test ,each correct answer carry +3 marks and incorrect answer -1 mark . Sona attemted the questions and scored +20 marks though she got 10 correct answers ? How many questions were given in the test?​

Answer 1

OK SO SHE GOT 20 MARKS AND GOT 10 CORRECT ANSWERS ,

10 CORRECT ANSWER = 10*3 = 30 MARKS ; BUT SHE ONLY GOT 20 MARKS

SO FOR 30 MARKS TO BECOME 20 MARKS YOU WOULD HAVE TO LOOSE 10 MARK SO

THERE WERE 20 QUESTIONS( as 1 incorrect question means 1 mark deduction)

BYE