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Cows

by shashank.ism » Mon Feb 08, 2010 10:46 am
Four black cows and three brown cows give as much milk in five days as three black cows and five brown cows give in four days. If a black cow gives 10 L of milk per day, then how much milk would be given by a brown cow per day under the same conditions.


a) 6 L
b) 8 L
c) 10 L
d) 12 L
e) 16 L
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by harsh.champ » Mon Feb 08, 2010 10:48 am
shashank.ism wrote:Four black cows and three brown cows give as much milk in five days as three black cows and five brown cows give in four days. If a black cow gives 10 L of milk per day, then how much milk would be given by a brown cow per day under the same conditions.


a) 6 L
b) 8 L
c) 10 L
d) 12 L
e) 16 L
Assume a black cow gives 'x' L milk per day and a brown

cow gives 'y' L milk per day.
⇒ 5(4x + 3y) = 4(3x + 5y)
⇒ 8x = 5y
x/y=5/8
Given that x = 10 L
[spoiler]∴ y = 16 L so E.[/spoiler]
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