Question

The president of a company gave two talks, one on Monday and one on Tuesday. A total of 405 employees attended the Monday talk, 275 attended the Tuesday talk and 55 went to both. How many employees attended at least one of the talks

Answer 1

Answer:

625 employees

Explanation:

Given that,

Let the Monday talk be A and the Tuesday talk be B,

Employees attend Monday talk: I A I = 405

Employees attend Tuesday talk: I B I = 275

Employees attend both talks: I A ∩ B I = 55

Employees attended at least one of the talks: I A ∪ B I

= I A I + I B I - I A ∩ B I

= 405 + 275 - 55

= 625