Homework Help: maths

Posted by Jannie on Tuesday, October 12, 2010 at 4:03am.

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 - Dr Russ, Tuesday, October 12, 2010 at 6:18am
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

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