hydsarema

 Profile Answers by hydsarema 

• Nov 25th, 2008

 

t=tea
c=coffee
m=milk
n=number of persons

n(c  or t or m)=n(c) +n(t) +n(m)-n(c &t)-n(t & m)- n(m & c) +n(c & t & m)

40+40+50-20-20-20+10=80

number of persons=80

sneha36

 Profile Answers by sneha36 

• Aug 29th, 2010

 

t=tea
c=coffee
m=milk
n=number of persons

n(c  or t or m)=n(c) +n(t) +n(m)-n(c &t)-n(t & m)- n(m & c) +n(c & t & m)

40+40+50-20-20-20+10=80

number of persons=80

Predhin

 Profile Answers by Predhin 

• Sep 25th, 2010

 

Let t represents tea
Let c represents coffee
Let m represents milk
Let n represents number of persons

n(c U t U m)=n(c) +n(t) +n(m)-n(c &t)-n(t & m)- n(m & c) +n(c & t & m)

n=40+40+50-20-20-20+10=80

number of persons, n=80

sudiptamukherjee

 Profile Answers by sudiptamukherjee 

• Oct 1st, 2010

 

n(c)=40;
n(t)=40;
n(m)=40;
n(c&t)=20;
n(t&m)=20;
n(m&c)=20;
n(c&t&m)=10
so, n(c or m or t)= n(c)+n(t)+n(m)-n(c&t)-n(c&m)-n(m&t)+n(c&m&t)
                          =40+40+50-20-20-20+10
                           =80

praneeta

 Profile Answers by praneeta 

• Oct 15th, 2010

 

Total number of people=80

akarun15

 Profile Answers by akarun15 

• Nov 26th, 2010

 

 Number of People:80

Sen Jacob

 Profile Answers by Sen Jacob 

• Jan 8th, 2011

 

You can also use Ven diagram for solving this kind of problems.
40%+40%+50%-20%-20%-20%+10% = 80%
So, if there is 100 people, 80 of them are drinking any of these.
How could we tell the exact number of people there?
If there is 10 people, 4drink tea, 4drink coffee, 5drink milk, 1drinks all the three. 2drink both coffee and tea, 2 drink both tea and milk, 2 drink both milk and coffee... :)
so I feel any multiple of 8 could be the answer :D
If I'm not wrong, for least case, 8 is the answer ;) (Ans: 8n - where n=1,2,3,...)
Please tell whether this helps you or not :)