A dance instructor conducts annual workshops in which he holds sessions for basic learners and trainers. In a particular year, 2000 people attended the workshop. 1500 participated as learners and 800 as trainers. How many participated as only trainers?
Total=2000
P(L)=1500
P(T)=800
Total=P(L)+P(T)-P(LnT)
2000=2300-P(LnT)
P(LnT)=300
P(T)=P(T)-P(LnT)
=800-300
=500
