Question

A conference was attended by 550 delegates. The number of delegates who drink tea is 400 and the number of delegates who drink te only is 200 Find how many drink only coffee
Dit all the 550 had a drink?

Answer 1

150drink only coffee
350drink coffee

Answer 2

Lets analyze the information as follows :

Those who drink tea only = 200

Those who drink both coffee and tea = 400 - 200 = 200

The remaining drink coffee only = 550 - 400 = 150

So 150 drink Coffee only.

they all had a drink.