SOLUTION: a cow eats 7 bags of feed in 9 days.how long will 12 cow take to eat the 7 bags

Question 921120: a cow eats 7 bags of feed in 9 days.how long will 12 cow take to eat the 7 bags

Found 2 solutions by josmiceli, stanbon:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
1 cow eats 7 bags of feed in 9 days
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12 times as many cows will take 1/12 of
that time to eat the same number of bags
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12 cows eat 7 bags of fed in day

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
3/4a cow eats 7 bags of feed in 9 days.how long will 12 cow take to eat the 7 bags
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t is inversely propotional to # of cows and directly proportional to # of bags.
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t = k*b/c
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Solve for "k" using "a cow eats 7 bags in 9 days"::
9 = k*7/1
k = 9/7
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Equation::
t = (9/7)b/c
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How long will 12 cow take to eat the 7 bags
t = (9/7)7/12
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t = 9/12 = 3/4 of a day
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Cheers,
Stan H.
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