Latest Wipro Aptitude Question SOLUTION: Grass in lawn grows equally thickand in a uniform rate. It akes 24 days for 70 cows and 60 for 30 cows . How many cows can eat away the same in 96 days? a) 18 b) 20 c) 21 d) 19

• Placement Papers
• /
• Wipro
• /
• Numerical Ability
• /
• Time and Work

Wipro Question Papers: Wipro Interview Experience(2) WIPRO Company Profile

(#M40155424) WIPRO Numerical Ability question Ratio and Propotions Keep an EYE

Grass in lawn grows equally thickand in a uniform rate. It akes 24 days for 70 cows and 60 for 30 cows . How many cows can eat away the same in 96 days?

a) 18
b) 20
c) 21
d) 19

Asked In Wipro Deepika (8 years ago)

Unsolved Read Solution (6)

Is this Puzzle helpful?   (55)   (22) Submit Your Solution Time and Work

Read Solution (6) :

anuj gupta  (8 years ago)

I think this approach is very long to solve this problem i try to reduce some step
g= grass initially, r= rate at which grass grow/day, c= cow eat grass/day
g+24r=70*24c=1680c-----------1
g+60r=60*30c=1800c--------->g=1800c-60r----------------2
by solving this 2 equation we have relation c=(3/10)r-------------3
g+96r=96nc
=>96nc=1800c-60r+96r=1800c+36r=1800c+120c=1920c
=>n=20

Is this solution Helpfull? Yes (16) | No (8)  

Mani Sankar Karanam  (7 years ago)

x = quantity of grass initially present.
k = rate of increase of grass per day.
y = quantity of grass that each cow eats per day.
x + 24k = 24*70y
x + 60k = 60*30y
Now let m cows needed to finish complete the task.
x + 96k = 96*m*y.
Find x and k in terms of y and substitute in the final expression.

Is this solution Helpfull? Yes (3) | No (2)  

MALAGOUNI BHARGAVI  (7 years ago)

plz explain againnn....clearly

Is this solution Helpfull? Yes (2) | No   

SHAIK MOHAMMED MUDASIR  (6 years ago)

Plzz anyone xplain these above problem clearly!!!

Is this solution Helpfull? Yes (2) | No   

shenba  (7 years ago)

20 cows....

Is this solution Helpfull? Yes (1) | No (4)  

  (4 years ago)

Let us imagine that 1 cow eats 1kg per day.
70 cows can eat 70kg in a day. Total quantity of grass eaten in 24 days = 24*70 = 1680kg
1680 = Initial quantity of grass + quantity of grass increased in 24 days.
1680 = Q + 24x

Similarly in second case

1800 = Q + 60x

By solving both equations, we get
x = 10/3

Q = 1680 - 24(10/3)
Q = 1600

Total quantity of grass available in 96 days = 1600 + 96(10/3)
= 1920

Number of cows required = N

1920/N should be equal to 96
N = 20

Is this solution Helpfull? Yes (1) | No   

Please Login to Read Solution.