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Math Help - hello guysss peep in for more

  1. #1
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    hello guysss peep in for more

    im a new user in this forum .. and i need a help .. please help me .. i have a doubt in maths ....
    3x-2 (x-3)=12 .. what is the number ?????????????
    please help me .. its soo urgent
    i 'll be back
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  2. #2
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    Re: hello guysss peep in for more

    Quote Originally Posted by arshiar8 View Post
    im a new user in this forum .. and i need a help .. please help me .. i have a doubt in maths ....
    3x-2 (x-3)=12 .. what is the number ?????????????
    please help me .. its soo urgent
    i 'll be back
    Do you mean
    3x-2(x-3)=12?

    is it not equivalent to
    3x-2*x-2*-3=12?

    which is
    3x-2x+6=12

    again
    3x-2x=12-6

    that is
    x=6
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  3. #3
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    Re: hello guysss peep in for more

    Quote Originally Posted by Kmath View Post
    Do you mean
    3x-2(x-3)=12?

    is it not equivalent to
    3x-2*x-2*-3=12?

    which is
    3x-2x+6=12

    again
    3x-2x=12-6

    that is
    x=6

    thankyou v much .. can u please clear my another doubt ????????

    " there were 25 questions in an examination . each correct answer carries 2 mark and one mark will be deducted for each wrong answer. a student wrote answers for every question and got 35 marks. how many answers were correct ?"
    - this is the question, please answer this also

    actually my niece want answer for these question cuz of confusion .. im suffering from fever also .. my brain is not working well cuz of headache ... i dunno how im sitting in front of ma laptop ............. please answer .. dis is a request
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  4. #4
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    Re: hello guysss peep in for more

    I think you have to say that the student answered all the 25 questions.

    Let us suppose that (the student answered all questions). Let x be the number of correct answers so the number of wrong answer will be 25-x.

    So his mark is
    2* correct answer - 1* wrong answers,

    since he got 35 marks, that means:

    2x-(25-x)=35
    that is
    2x-25-(-x)=35
    hence
    2x+x-25=35
    3x-25=35
    3x=35+25
    3x=60
    x=20

    So the student has 20 correct answers and 5 wrong answers,
    2*20=40
    -5 for the wrong answers

    that is 40-5 =35!
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