Question

Eight cow or six bulls feed one ground in twelve days. How many days will the four cow and nine bulls feed on the same ground?

Answer 1

Eight cows --- 12 days
One cow --- 12*8 = 96 days
One day work of 1 cow --- 1/96
One day work of 4 cows --- 4/96=1/24

Six bulls --- 12 days
One bull --- 12*6 = 72 days
One day work of 1 bull --- 1/72
One day work of 9 bulls ---9/72 = 1/8
One day work of 4 cows and 9 bulls
= 1/24 + 1/8 = 4/24 = 1/6
So , they will feed the ground in 6 days