Let Kyle's and Meredith's ages be K and M, respectively

Then we get: K + M = 68_____M = 68 - K ------ eq (i)

Also, K - 8 = 3(M - 8) ------ eq (ii)

K - 8 = 3(68 - K - 8) ------- Substituting 68 - K for M in eq (ii)

K - 8 = 3(60 - K)

K - 8 = 180 - 3K

4K = 188

Kyle's age, or  

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