Homework Help: math

Posted by Brayden on Thursday, October 21, 2010 at 11:06pm.

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 - Henry, Saturday, October 23, 2010 at 10:29pm
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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