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    Skyrocket Away's Avatar
    Skyrocket Away Posts: 173, Reputation: 6
    Junior Member
     
    #1

    Oct 5, 2008, 07:08 PM
    Can someone answer this for me?
    Please, I don't understand how to get this answer. I have asked all my friends and everything. No one seems to know how to get the answer, or what it is. Can you please just help! D:


    "Applicants for an advertised position are required to take a 30-question multiple-choice test. The applicant earns 5 points for each correct answer and loses one point for each incorrect answer.

    Anatoli answered all 30 questions on the test and recieved a score of 120. How many questions did he answer correctly?

    (1) 5
    (2) 10
    (3) 15
    (4) 25
    (5) 30"
    ISneezeFunny's Avatar
    ISneezeFunny Posts: 4,175, Reputation: 821
    Ultra Member
     
    #2

    Oct 5, 2008, 07:21 PM

    Since there are 30 questions, divide them up.

    Call X the number of RIGHT questions, and call (30 - X) the number of wrong questions.

    since he gets 5 points for the right questions, and -1 for the wrong

    5(X) + (-1)(30-x) = 120

    5x - 30 + x = 120

    6x - 30 = 120

    6x = 150

    x = 25

    and then check your answer.

    if he got 25 right, then he now has 125 points, and he also got 5 wrong, so -5... 120
    Skyrocket Away's Avatar
    Skyrocket Away Posts: 173, Reputation: 6
    Junior Member
     
    #3

    Oct 5, 2008, 07:27 PM
    Quote Originally Posted by ISneezeFunny View Post
    Since there are 30 questions, divide them up.

    Call X the number of RIGHT questions, and call (30 - X) the number of wrong questions.

    since he gets 5 points for the right questions, and -1 for the wrong

    5(X) + (-1)(30-x) = 120

    5x - 30 + x = 120

    6x - 30 = 120

    6x = 150

    x = 25

    and then check your answer.

    if he got 25 right, then he now has 125 points, and he also got 5 wrong, so -5...120
    Thank you so much, so, so much. :D:D:D:D

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