Let E be the event in which the spokesperson will be a male and F be the
event in which the spokesperson will be over 35 years of age.
Accordingly P(E)=35 and P(F)=25 Also P(E∩F)=15
We know that P(E∪F)=P(E)+P(F)−P(E∩F)
∴P(E∪F)=35+25−15=45
Thus the probability that the spokesperson will either be a male or over 35 years of age is 45