In a company, 35% of the employees drink coffee, 40% of the employees drink tea and 10% of the employees drink both tea and coffee. What % of employees drink neither tea nor coffee?

Question

Prepp Team · Accepted Answer

Calculating Percentage of Employees Drinking Neither Beverage

This problem involves finding the percentage of employees who belong to neither the 'tea drinkers' group nor the 'coffee drinkers' group.

We are given:

Percentage of employees drinking coffee, $ P(C) = 35\% $
Percentage of employees drinking tea, $ P(T) = 40\% $
Percentage of employees drinking both tea and coffee, $ P(C \cap T) = 10\% $

Applying the Inclusion-Exclusion Principle

To find the percentage of employees who drink at least one of the beverages (coffee or tea or both), we use the Principle of Inclusion-Exclusion:

$ P(C \cup T) = P(C) + P(T) - P(C \cap T) $

Substituting the given values:

$ P(C \cup T) = 35\% + 40\% - 10\% $ $ P(C \cup T) = 75\% - 10\% $ $ P(C \cup T) = 65\% $

This means 65% of the employees drink either coffee or tea or both.

Determining Percentage Drinking Neither Beverage

The total percentage of employees is 100%. To find the percentage of employees who drink neither tea nor coffee, we subtract the percentage of those who drink at least one beverage from the total:

$ \text{Percentage drinking neither} = 100\% - P(C \cup T) $ $ \text{Percentage drinking neither} = 100\% - 65\% $ $ \text{Percentage drinking neither} = 35\% $

Therefore, 35% of the employees drink neither tea nor coffee.