Question

A farmer has food to feed his 20 cows for 60 days. If he buys 10 more cows, for how many days will he have food?

Answer 1

Answer:

It would be for 40 days

Step-by-step explanation:

60*20/30

Answer 2

Answer:

40 days

Step-by-step explanation:

Let x be the amount of food required by one cow for a day

then food required by 20 cows = 20x

for 60 days =20x * 60

                   =1200x------equation 1 (which is the total food with him)

if he buys 10 more cows total cows = 30

total food for a day = 30x

let the no of days he can serve be N

then total food for N days = 30x * N

(which is the same amount he initially had)

so 1200x= 30x * n

n = 40