Mathematics, 17.03.2022 01:00 Ezekielcassese
Kathryn's age was 3 times Cody's age. How old is Kathryn now? The student writes out his solution, noting what he did: Cody now = c, so Cody 7 years ago was c - 7 Kathryn now = k, so Kathryn 7 years ago was k - 7 Cody is 44 years younger than Kathryn, so c = 44 - k 7 years ago, Kathryn's age was 3 times Cody's age k-7 = 3(c - 7) k-7 = 3[44 - k - 7] Substitute for c using c = 44 - k k-7 = 3[-k + 37] Simplify k-7 = -3k + 111 4k = 118 k = 29.5 There is no way that Kathryn's age is 29.5 if Cody is supposed to be 44 years younger than Kathryn, so what went wrong? What mistake did the student make?
Answers: 1
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Kathryn's age was 3 times Cody's age. How old is Kathryn now? The student writes out his solution, n...
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