Hi,

Enrique is 61 and his niece Zoe is 7. 

In how many years  will Zoe be one fourth Enrique's age?

   

      4(7+x) =  (61 + x)

      28 + 4x = 61 + x

        3x = 33

         x = 

CHECKING our answer***

    18 = (1/4)72 

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