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
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
1 answer
1 answer