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Math Help - did this equation b+3+b=68

  1. #1
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    did this equation b+3+b=68

    .....for this problem and I don't kno what am I doing wrong. I did it jus like Mark showed me >.>



    Mr. Alfaro has 3 times as many Pre-Algebra students than Beginning Algebra students. If Mr. Alfaro has a total of 72 students, find the number of students in each course.

    a) Write the equation you would use to solve this problem, using as the number of Beginning Algebra students. ___________

    b) After solving the equation, how many Beginning Algebra students does Mr. Alfaro have? __________

    c) After solving the equation, how many Pre-Algebra students does Mr. Alfaro have? __________
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  2. #2
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    Re: did this equation b+3+b=68

    What two equations do you have from the information given?
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  3. #3
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    Re: did this equation b+3+b=68

    I got 3+b+b=72
    then i subtract -3 from both side
    got b+b= 69/2
    b=34.5 then I did 3+34.5 =37.7

    so I got B= 34.5 and P =37.5 both equal to 72
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  4. #4
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    Re: did this equation b+3+b=68

    well now I'm working with different numbers but same concept.
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  5. #5
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    Re: did this equation b+3+b=68

    Let p be the number pf Pre-Algebra students,a dn b be the number of Beginning Algebra students.

    From the statement "Mr. Alfaro has 3 times as many Pre-Algebra students than Beginning Algebra students" we may write:

    p=3b

    You see this is a bit different from the previous problems because we are give that one quantity is a certain multiple of the other rather than being told one is a certain amount more or less than the other.

    From the statement "Mr. Alfaro has a total of 72 students" we may write:

    p+b=72

    Now, what should you do next?
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  6. #6
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    Re: did this equation b+3+b=68

    but formy first equation I did... b+3+b=68
    -3 -3
    _____________
    b + b = 65
    2b = 65
    b=32.5 ; /
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  7. #7
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    Re: did this equation b+3+b=68

    Quote Originally Posted by MarkFL2 View Post
    Let p be the number pf Pre-Algebra students,a dn b be the number of Beginning Algebra students.

    From the statement "Mr. Alfaro has 3 times as many Pre-Algebra students than Beginning Algebra students" we may write:

    p=3b

    You see this is a bit different from the previous problems because we are give that one quantity is a certain multiple of the other rather than being told one is a certain amount more or less than the other.

    From the statement "Mr. Alfaro has a total of 72 students" we may write:

    p+b=72

    Now, what should you do next?


    3b+b=72
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  8. #8
    MHF Contributor MarkFL's Avatar
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    Re: did this equation b+3+b=68

    Yes, so what do you find when you solve for b?
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  9. #9
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    Re: did this equation b+3+b=68

    Quote Originally Posted by MarkFL2 View Post
    Yes, so what do you find when you solve for b?
    b=18
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  10. #10
    MHF Contributor MarkFL's Avatar
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    Re: did this equation b+3+b=68

    Correct, so what must p be?
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  11. #11
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    Re: did this equation b+3+b=68

    Quote Originally Posted by MarkFL2 View Post
    Correct, so what must p be?

    P=54
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  12. #12
    MHF Contributor MarkFL's Avatar
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    Re: did this equation b+3+b=68

    Yes. Good work!
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