They(drink).......coffee when I arrived (put verbs into suitable tenses

In a group of 25 people, 17 drink tea. Out of these 10 drink only tea. Find how many people drink coffee but not tea ? It is given that each one takes atleast one drink.

A survey of 170 families, 115 drink coffee, 110 drink tea and 130 drink milk. Also 85 drink coffee and milk, 75 drink coffee and tea ,95 drink tea and milk, 70 drink all the three. Find How many use Coffee and Milk but not Tea.

In a group of 500 persons,300 take tea,150 take coffee,250 take cold drink,90 take tea and coffee,110 take tea and cold drink,80 take coffee and cold drink,and 30 take none of the three drinks.Find the number of person who take all the three drinks.

In a group of 52 persons, 16 drink tea but not coffee and 33 drink tea. Then, the number of persons who drink coffee but not tea, is