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3rd grade Math

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In Harry's attic there are 3 spider webs. The first web is twice as large as the second. The 3rd web is 3 inches larger than the 1st web. The combined width of the 3 webs is 1 foot and 6 inches. How long is each web?

Please provide explanation along with answer. Thank you in advance.

  • 3rd grade Math -

    The original data is given in terms of area, but the width is not in the same units.

    If area 1 = x, then area 2 = 2x and area 3 = x + 3.

    If the total area = 18 square inches, then

    x + 2x + x + 2 = 18

    Then you can solve for x.

    4x + 2 = 18

    4x = 16

    x = 4

  • 3rd grade Math -

    I'll answer since this is unanswered, but, I don't think this is how a third grade student is expected to do this problem.

    w = width of web
    w = size in inches of the 2nd web
    2w = size in inches of the 1st web
    2w + 3 = size in inches of the 3rd web

    1'6" = 18 inches
    w + 2w + (2w + 3 ) = 18
    5w + 3 = 18
    5w = 15
    w = 3

    1st web = 3 inches
    2nd web = 6 inches
    3rd web = 9 inches
    Total combined width = 18 inches

  • 3rd grade Math -

    I would be very interested to learn how a grade 3 teacher would handle this type of question without relying on algebraic methods such as shown above by
    PsyDAG and helper.

    This sure looks like some fancy advanced grade 3 stuff.

  • 3rd grade Math -

    what is symmetry

  • 3rd grade Math -

    whats up

  • 3rd grade Math -

    you stupid

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