### How many cows are needed to eat the grass in 96 days?

Grass in lawn grows equally thick and in a uniform rate. It takes 24 days for 70 cows and 60 days for 30 cows to eat the whole of the grass.

How many cows are needed to eat the grass in 96 days?

20 cows

g - grass at the beginning
r - rate at which grass grows, per day
y - rate at which one cow eats grass, per day
n - no of cows to eat the grass in 96 days

From given data,
g + 24*r = 70 * 24 * y ---------- A
g + 60*r = 30 * 60 * y ---------- B
g + 96*r = n * 96 * y ---------- C

Solving for (B-A),
(60 * r) - (24 * r) = (30 * 60 * y) - (70 * 24 * y)
36 * r = 120 * y ---------- D

Solving for (C-B),
(96 * r) - (60 * r) = (n * 96 * y) - (30 * 60 * y)
36 * r = (n * 96 - 30 * 60) * y
120 * y = (n * 96 - 30 * 60) * y [From D]
120 = (n * 96 - 1800)
n = 20

Hence, 20 cows are needed to eat the grass in 96 days.

## My Blog List

• Edwin van der Sar meminta manajer Manchester United untuk segera membangkitkan motivasi para pemain. Manchester United mengundang perhatian dari para manta...
• Closer to the eye of the shooter, this is because Preview is quite literally applying a filter to each individual page of the PDF you are saving. the proce...
• INTRA NIFTY *f**u**t**u**r**e*S FOR 29.10.09 Hi Friends, Happy to meet you all again. I am going to post my 98% accuracy Nifty *f**u**t**u**r**e*s Intrad...
• Do It Yourself *P**r**o**j**e**c**t* : Menyelenggarakan Multipoint Video Conferencing Menggunakan Skype Gubernur Sulawesi Selatan Berkomunikasi dengan Ti...
• A: There is nothing like Virtual Constructor. The Constructor can’t be virtual as the constructor is a code which is responsible for creating an instance o...
• The application server is run by the Computer Administration Group at the Mechanical Engineering Departmentt. One of the objectives of this course is to...
• इंडिक ट्रांसलिटरेशन गूगल ट्रांसलिटरेशन इंग्लिश शब्दों को हिन्दी में टाइप करने में मदद करता है। इसकी खासियत है के आप कोई भी हिन्दी शब्द का इंग्लिश स्पेलिंग ...
• Demo Requirements This session requires 1 machine (called Server1 in this document). Minimum Hardware Requirements: Server1 *Processor* 400Mhz *Memory...
• IE App Compat VHD - Time bomb 4/2009 Posted: 02 Jan 2009 01:18 PM CST VPC Hard Disk Image for testing websites with different IE versions on Windows XP ...
• CRACK THE INTERVIEW *What Is .NET?* .NET is a powerful object-oriented computing platform designed by Microsoft. In addition to providing traditional soft...