Question

in a test +3 marks are given for every correct answer and -1 mark is given for every incorrect answer .Sona attempt all questions and scored + 20 marks though she got 10 correct answers how many in correct answers has she attempted ?how many questions were given in the test ?please give in steps

Answer 1

10 answers were incorrect and there were 20 question

Answer 2

she attempted 10 right answer that is 10*3=30
equartion
30-x=20
x=30-20
x=10

so we conclude that she attempted 10 wrong numbers