Examination 2

A teacher awards two marks for every correct answer and subtracts a mark for every wrong answer in an examination. If there were 20 questions and a child scored 25 marks, how many correct answers did the child get?

Correct answer:

c =  15

Step-by-step explanation:


25 = 2c - 1·(20-c)

25 = 2·c - 1·(20-c)

3c = 45


c = 45/3 = 15

c = 15

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