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
Answer Posted / 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 |
Post New Answer View All Answers
What is the probability of getting a sum 9 from two throws of a dice?
Light glows for every 13 seconds . How many times did it glow between 1:57:58 and 3:20:47 am.
A, B, C made trips to PIZZA centre B made 2.4 times more trips then ! , C made 6 more then A Total Min trips are
Fill the empty slots. Three FOOTBALL teams are there. Given below the list of maches. played won lost draw Goals for Goals against A 2 2 *0 *0 *7 1 B 2 *0 *1 1 2 4 C 2 *0 *1 *1 3 7 the slots with stars are answers.
Reversing the digits of father's age we get son's age. One year ago father was twice in age of that of his son? find their current ages?
f(x) = 10x3 + ax2 + bx – 63. If f(-1) = -8 and one of the factors of the given equation is 2x + 3, then find the values of 'a' and 'b'.
what is the largest prime number in 8 digit number?
There is a rectangular terrace whose length and width are 60m X 20m. There is a walkway of uniform width around terrace. Area of walkway is 516m^2. Find width of walkway:
When Raja was born, his father was 32 years older than his brother and his mother was 25 years older than his sister. If Raja’s brother is 6 years older than Raja and his mother is 3 years younger than his father, how old was Raja’s sister when Raja was born?
. Select the correct statement a. NEXT SENTENCE and CONTINUE functionally does the same. b. Never can code a DECLARE CURSOR statement in procedure division. c. Edited numeric characters can be included in arithmetic operations. d. The Sub parameters of a DCB parameter are Keyword parameters.
A can do a piece of work in 30 days, which B can do in 20 days. Both started the work but A left 5 days before the completion of the work. It took how many days to complete the work?
500 men are arranged in an array of 10 rows and 50 columns . ALL tallest among each row aare asked to fall out . And the shortest among THEM is A. Similarly after resuming that to their originaal podsitions that the shorteest among each column are asked to fall out. And the longest among them is B . Now who is taller among A and B ?
1. Profit and loss problem.. Two mercants sold a good of worth Rs 1000 from which one merchant A got profit from selling prices and merchant B got profit form cost price and profit for both is 25% what is difference amount.? 2.5lts solution bottles in which 4 lts of solution is filled in which 15 % of salt is mixed,1.5 lits solution is fell out and it is filled with water how much of salt content is present..? 3.Square of 21 cms and bull was tied at corner with rope of 7 cms how much area it can graze... 4.A and B can do a work 15 and 20 days respectively form which A as done half of the work and then b joind then it done 1/20th work how much many days in which a complted work which left by B.
Ravi's salary was reduced by 25%.Percentage increase to be effected to bring the salary to the original level is
If the product of three consecutive int is 210,then sum of the two smaller ints is: