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January 31, 2015

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

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 6:18amAgain 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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