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The square of Janets age is 400 more then the square of the sum of Kim's and Sue's...
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High School Teacher
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Let Janet's age be "x".
Kim+Sue's ages = x - 10
The square of Janet is `x^2.`
The square of the sum of Kim & Sue's ages = `(x-10)^2`
Since Janet's is 400 more,
`x^2 = (x-10)^2 + 400`
`x^2 = x^2-20x+100+400`
`20x = 500`
`x = 25`
Janets is 25 years old, and Kim and Sue's ages together total 15.
The square of Kim's age is 625. The square of the sum of Kim and Sues ages is 225.
Posted by baxthum8 on October 21, 2013 at 9:49 PM (Answer #1)
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