Let price of 1 goat and 1 sheep, be G, and S, respectively

Then, 12G + 12S = 600____12(G + S) = 12(50)____G + S = 50 ------ eq (i)

Also, S = 2G ------ eq (ii)

G + 2G = 50 -------- Substituting 2G for S in eq (i)

3G, or 3 goats cost: $

 ------ Substituting  for G in eq (ii)

S, or price of 1 sheep = , or $

Price of 3 goats and 1 sheep: 50 + 33.33, or $ 

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