a) The facts that out of 548 students, 162 read The Guardian and 124 read The Vanguard, while 320 Students read neither, are illustrated in the attached Venn Diagram.
b) The number of students who read neither The Guardian nor The Vanguard is 320 as given.
The total number of students surveyed = 548
The number of students who read The Guardian = 162
The number of students who read The Vanguard = 124
The number of students who read neither = 320
The number of students who read both The Guardian and The Vanguard = 58 (162 + 124 + 320 - 548)
The number of students who read only the Guardian = 104 (162 - 58)
The number of students who read only the Vanguard = 66 (124 - 58)
Thus, we can conclude that 58 students read both The Guardian and The Vanguard.