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In Harry's attic there are three spider webs. The first web is twice as large as the second web. The third web is 3 inches larger than the first web. The combined width of the three webs is 1 foot and 6 inches.

Aunt is stumped again!

  • math -

    2nd web = x in,
    1st web = 2x in,
    3rd web = (2x + 3) in.

    x + 2x + (2x + 3) = 18 in,
    5x + 3 = 18,
    5x = 18 - 3,
    5x = 15,
    x = 15 / 5 = 3 in,
    2x = 2 * 3 = 6 in,
    2x + 3 = 2*3 + 3 = 6 + 3 = 9 in.

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