Of 300 employees 155 use phone, 175 use email, how many use both phone and email?

Question

In a certain business, all 300 employees use the phone or email. 155 use the phone, 175 use email, how many use both the phone and email?

Answer 1

=In a certain business, all 300 employees use the phone or email. 155 use the phone, 175 use email, how many use both the phone and email?

155 use the phone, 175 use email,

if you add the two groups

155+175 = 330

since the business only has 300 employees not 330, we can assume that 30 people from each group are the same person

30 employees use both

125 use phone onlt

145 use email only

30+125+145=300 total employees