In five days, four black cows and three brown cows give as much milk, as five brown cows and three black cows would give in four days.

Which color cows are the best milk producers?

Lets say...
A black cow produces a litres of milk a day
& brown produces b litres a day

...so in 5 days we have 5(4a+3b) litres ... which is the same as in 4 days for 4(3a+5b)

:. 5(4a+3b) = 4(3a+5b)    
:. 8a = 5b

In Mooing terms - 5 Brown cows are as good as 8 Black cows ( in producing milk ) -

So Browns Mooooos...& Blacks loooos

Posted by Syzygy on 2004-09-03 10:02:36