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2. Determine the height of a goat.
  What is the height of a goat, which is 10 feet less than a elephant has, and the height of a elephant is 6 times more than the height of a goat?
 

Explanation:
x = y - 10; y = 6x. Therefore: x = 6x - 10; 5x = 10. Hence: x = 2.