SUPER EASY MATH/RIDDLE QUESTION!! 10 POINTS!! CLICK HERE!!?

at a math contest there were 12 problems

2 points deducted for an incorrect answer

5 points gained for a correct answer

matt had 39 points

how many did he answer correct??

10 points! :)

9 Answers

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  • Anonymous
    1 decade ago
    Favorite Answer

    Let the number of questions he answered correct be x.

    Hence he answered (12-x) incorrect.

    Since 5 points for correct and minus 2 for incorrect,

    Total score = 5x -2(12-x)

    = 5x - 24 + 2x

    = 7x - 24

    He scores 39 points so 7x - 24 = 39

    7x = 63

    x = 9

    Thus he got 9 correct

    Hope I was of help!

    <3 phantasmal.spirit

  • 1 decade ago

    Hi,

    I am assuming that he answered all the 12 questions

    Let correct answers = x

    then incorrect answers = 12 - x

    => 5x -2(12 - x) = 39

    => 5x - 24 + 2x = 39

    => 7x - 24 = 39

    => 7x = 39 + 24

    => 7x = 63

    => x = 63/7

    => x = 9

    therefore:

    correct answers = x = 9

    and incorrect answers = 12 - x = 12 - 9 = 3

    Hope to answer you well, keep smiling, bye.

    Source(s): school
  • 1 decade ago

    The closest multiple of 5 near 39 is 40 but since 2 points are detducted for a wromg answer this cannot be rite. The next multiple is 45 which agrees if he gave 9 correct and 3 wrong answers.

  • 1 decade ago

    9 correct answer (45 points gained)

    3 incorrect answer (6 points deducted)

    He had 39 points.

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  • 1 decade ago

    if he got 12 correct ans. he got 60 points. every incorrect answer that replaces a correct answer he loses 7 pts. so

    60-39=21(total no. of pts. lost)/7=3 incorrect, 9 correct

  • sv
    Lv 7
    1 decade ago

    5x --2(12 -- x) = 39 whence x = 9 correct answers and 3 wrong.

  • 1 decade ago

    9 is the correct answer.

  • Anonymous
    5 years ago

    Yea he likes u and he seems 2 b shy so he'll never have the courge 2 ask u out so just ask if he wants 2 go out with u sometime

  • 1 decade ago

    9 correct answers!!! and 3 wrong!!!!!

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