Venn diagram question

[alltimeacheiver]

Ques

80 Percent of the people in a party drinbk coffee, 10 percent of these also drink tea. 10 Percent in a party neither of these two drinks. what percent of the people in the party drink?

a coffee only, b only tea, c tea

What is the answer it got coffee

[selango]

This is not a GMAT question.Always post/solve problems from authentic sources.

[srcc25anu]

coffee not coffee total
tea 10 10 20
not tea 70 10 80
total 80 20 100

hence only coffee = 70%
only tea = 10%
Tea = 20%

[MAAJ]

Use a table instead of a Venn diagram for these type of questions. With practice you will determine which one is better to use in each case.

[atulmangal]

IMO

a) 72% people drink coffee only
b) 10% people drink tea only
c) 18% people drink tea

[Vish_]

IMO
[spoiler]
a) 72%
b) 10%
c) 18%
[/spoiler]

[cans]

Ques

80 Percent of the people in a party drink coffee, 10 percent of these also drink tea. 10 Percent in a party neither of these two drinks. what percent of the people in the party drink?

a coffee only, b only tea, c tea

What is the answer it got coffee

let total=100
80=C ; 10% of 80 = 8 both t*c
10 neither t nor c...
a) only coffee = 80-8 = 72 (=coffee - both tea& coffee)
b) only tea = 100-80-10 = 10
c) tea = 10+8 = 18 (=only tea + t&c)