Post a New Question

maths

posted by .

In a test there were 25 multiple-choice questions. They were marked as follows:
2 marks for each correct answer
0 marks for a non-attempt
1 mark for an incorrect answer.
Sarah attempted
4
5 of the questions and received 22 marks. How many questions did
she answer correctly?

  • maths -

    Again we can set this up as two simultaneous equations

    2 marks for each correct answer A
    0 marks for a non-attempt (not interested in these)
    1 mark for an incorrect answer B

    A+B=20 (she only answered 4/5 of 25 questions)

    2A+B=22 based on the marks

    solve the two for A

Answer This Question

First Name
School Subject
Your Answer

Related Questions

More Related Questions

Post a New Question