In a grass field, If there are 40 cows, they could eat for
40 days. If there are 30 cows, they could eat for 60 days.
Than if 20 cows, How much day they could eat?
a) 60 b) 80 c)55 d)50

Answers were Sorted based on User's Feedback



In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / ajeesh

80

Is This Answer Correct ?    44 Yes 4 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / lime

40
40

30
60

- 10 cows
+ 20 days

if 40 cows can eat for forty days
then 20 cows can eat for 80 days

Is This Answer Correct ?    14 Yes 2 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / subash

All, the choice given are wrong ...

Let 'x' be the amount of grazed by a cow per day,

Let 'y' be the growth rate of grass per day,

Let 'z' be the amount of grass present initially,

So, 40 cows can graze (40*x) amount of grass per day and
(40*x*40) amount of grass for 40 days.

For 40 days, the growth of grass is (40*y)

So, (40*x*40) = (z + 40*y)

For 30 cows it takes 60 days, so,

(30*x*60) = (z + 60*y)

so, 1600x - 40y - z = 0 ----- 1

1800x - 60y - z = 0 ----- 2

Subtracting we get, 10x = y , Sub. 10x=y in 1 or 2, we get z
= 120y or z = 1200x

For, 20 cows,

20*x*N = z + N*y

Sub, 10x=y and (z=120y or 1200x), we get N = 120

Therefore, for 20 cows it takes 120 days to graze.

Is This Answer Correct ?    9 Yes 0 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / arun

80

Is This Answer Correct ?    10 Yes 2 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / ayyangar

options are suspectable...
isn't it?
answer is 120
For 25 cows the days required are 80..
observe the equations
(40*x-g)*40=(30*x-g)*60=(20*x-g)*n.
where x is grass units per a cow,
g grass units incresed.
n is number of days reqired...

Is This Answer Correct ?    10 Yes 3 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / meenu sharma

80

Is This Answer Correct ?    9 Yes 3 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / sujatha

b)80

Is This Answer Correct ?    8 Yes 3 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / -

b) 80

Is This Answer Correct ?    6 Yes 1 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / b.saravanan

answer is b)80 because the number of cows (20) which is
less than 30cows so obviously it will eat for more than 60
days

Is This Answer Correct ?    6 Yes 3 No

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they cou..

Answer / hariprasad

Answe is option B (i.e 80)

Is This Answer Correct ?    5 Yes 3 No

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