Story of the Three Farmers
Three farmers paid $ 1,000 for a small pasture. One farmer grazed his 9 mules, another his 12 cows for twice the time and last man put in some goats for 21 times as the second man's cows and paid half the cost of the pasture.
Can you find out how many goats did the last man have, if 6 cows eat as much as 4 mules, and 10 goats as much as 3 cows? And how much did the first and second man each pay?
any detailed solutions? thank you in advance