Question
During one quiz, points were awarded for questions answered as shown.

  Points per question
Correct 7
Wrong - 4 
Missed - 2

The ratio of the questions correctly to questions answered wrongly to questions that were missed out was 10 : 4 : 1. If Opal was awarded 156 points, how many questions are there in all?
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During one quiz, points were awarded for questions answered as shown.

  Points per question
Correct 7
Wrong - 4 
Missed - 2

The ratio of the questions correctly to questions answered wrongly to questions that were missed out was 10 : 4 : 1. If Opal was awarded 156 points, how many questions are there in all?