Find number of people

If there are some people, out of which 40% drink coffee, 40% drink tea, 50% drink milk, 10% drink all the three, 20% drink both coffee and tea, 20% drink both tea and milk, 20% drink both milk and coffee and 10 people wont drink any of the three. so find out how any people were there actually?

Questions by saisudha.m

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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

no of people wont drink any of them=10
total no peole drink=80 - 10=70

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praveenbiggod

  • Dec 9th, 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 drink=80


No. of people wont drink any of them=10
but they are asking number of persons so i.e = 80+10=90


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