math

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the best way to teach problem solving like the teacher has 15 student in his class and there are 3 more girls than boys how many girls than boys are there.

  • math -

    You have to learn how to "translate" the English into Math.
    take it in pieces:

    "there are 3 more girls than boys "

    If we let the number of boys be x
    then the above says there are x+3 girls

    "the teacher has 15 student in his class"
    or
    the sum of the number of boys and girls is 15
    x + x+3 = 15
    2x = 15-3
    2x = 12
    x = 6

    check: if there are 6 boys then there have to be 6+3 or 9 girls.
    Are there 15 students in the class?
    is 6+9 = 15 ?

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