Question 821870
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Hi,
A farm house shelters 26 animals. 
Some are goats and some are ducks
  x are goats and (26-x) are ducks
Question states*** Altogether there are 90 legs.
  4x + 2(26-x) = 90 legs
     2x = 38
      x = 19, the number of goats.  7 ducks   (26-19)
CHECKING our answer***
   76 + 14 = 90 legs