Posted by Jannie on .
In a test there were 25 multiplechoice questions. They were marked as follows:
2 marks for each correct answer
0 marks for a nonattempt
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 
PsyDAG,
Data confusing about how many Sarah attempted. Repost in clearer terms.