7) (a) In a mathematics competition there are 15 problems. For every correct answer you are
awarded 3 marks, but if an answer is incorrect one mark is deducted from the score. If Carl
attempted all 15 questions and his score was 29, how many did he answer correctly?
(b) In another math competition, you are awarded 5 marks for each question answered correctly
and one mark is deducted for an incorrect answer. If there are 30 questions in the competition, a
student attempts all 30 and receives 108 marks, how many of the students answers were wrong?
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Answer:
b) 52
Step-by-step explanation:
30×5= 150
-108 = 52
so , his 52 answers were wrong
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