4MA0 Foundation January 2014 Paper 2R Q7

7 Some students take part in a quiz.
They all start with a score of zero.
When a student gives a correct answer, 1 point is added to the student’s score.
When a student gives a wrong answer, 1 point is subtracted from the student’s score.

Kasa has −4 points.
Mansi has 7 points.

Malik has −3 points.
He then gives the correct answer to 14 questions and the wrong answer to 5 questions.

Trena has 12 points.
She gave the correct answer to 21 questions.