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(a) student A score = 24 * 5 – 11 * 2 = 120 – 22= 98

student B score = 25 * 5 – 14 * 2 = 125 – 28 =97

student C score = 22 * 5 – 8 * 2 = 110 – 16 = 94

Student A has the highest score of 98 points.

(b) Student D attempted 30 questions with 94 + 21 = 115 points.

For each question that he answered correctly, he gain 5 + 2 = 7 points. 

So he had answered 21/7 =3 more questions correctly than student or student D had answered 22+3 = 25 questions correctly.

Checking: 25*5 – 5 * 2 = 125 – 10 = 115

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