Posted by **Jannie** on Friday, October 15, 2010 at 12:38am.

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?

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