SOLUTION: The number of cows on a farm increased by 60. Because of better food, the amount of milk from each cow went up from 12.8 liters per day to 15 liters per day on the average. How man

Question 1013612: The number of cows on a farm increased by 60. Because of better food, the amount of milk from each cow went up from 12.8 liters per day to 15 liters per day on the average. How many cows are on the farm if the farmer gets 1340 liters of milk more per day?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the number of cows originally
on the farm
= liters of milk from cows
-----------------------
= number of cows later on
= liters of milk from cows
-----------------------
Let = liters of milk/day originally
= liters of milk later on
----------------------------------
Equation for case with cows:
(1)
Equation for case with cows
(2)
----------------------------------
Substitute (1) into (2)
(2)
(2)
(2)
(2)
(2)
and

There are 260 cows on the farm
---------------------------
check:
(1)
(1)
(1)
and
(2)
(2)
(2)
(2)
OK

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