Hi,

Tyler is one year older than 3 times Clay's age.

Clay's age:  x

Tyler's age: (3x+1)

Question states***sum of their ages is 21

Clay + Tyler = 21

  x + (3x+1) = 21

  x + 3x + 1 = 21

      4x = 20

       x = 5, Clay's age.  Tyler is 16

and...

  

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