Kosuke wrote a mathematics contest consistingof 25 multiple choice questions, the scoring system gave 6 points for a correct answer, 2 points for not answering, and 1 point for an incorrect answer.Kosuke got x correct and left y unanswered questions

a) write an expression for the number of questions he answered correctly

b) write an expression , in simplifed form, for Kosuke's score

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  1. What is confusing. The problem says, "Kosuke got x correct" and then asks for "an expression for the number of questions he answered correctly "

    Ummm, x?

    For the score, just multiply the points by each type of question:

    If there were 25 questions, and he answered x and left y unanswered, then that means that the remainder 25-(x+y) were wrong:
    score = 6x + 2y + (25 - (x + y))
    = 6x + 2y + 25 - x - y
    = 25 + 5x + y

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