A mathematics quiz contains 40 questions. Each correct answer is given 5 marks and each incorrect answer is deducted 3 marks. Sofian and Ridzuan participated in the quiz. Sofian answered 36 questions correctly while Ridzuan was deducted 24 marks for the incorrect answers.
(a)How many questions did Ridzuan answer incorrectly?
(b)Calculate the difference between Sofian’s marks and Ridzuan’s marks.