4 black cows, 3 brown cows gives as much milk in 5 days as 3
black cows and 5 brown cows in 5 days. which colour cow gives
more milk

Answer Posted / satish

4*black + 3*brown=5days
3*black + 5*brown=5days
so,
4*black + 3*brown=3*black + 5*brown
4*black - 3*black=5*brown-3*brown
1*black=2*brown
so, balck gives twice as much milk as brown gives.

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