In a group of 100 persons, 80 take tea, 30 take coffee and 20 take both tea and coffee. How many persons take neither tea nor coffee.

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

In a survey of 600 students in a school, 150 students were found to be taking tea and 215 taking coffee, 150 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

In a group of 70 people, 37 like coffee, 52 like tea and each person likes at least one of the two drinks. How many people like both coffee and tea?

In a group of 60 people, 27 like cold drinks and 42 like hot drinks and each person likes at least one of the two drinks. How many like both hot drinks and cold drinks?

There are 210 members in a club. 100 of them drink tea and 65 drink tea but not coffee. How many drink coffee but not tea?

Out of 20 members in a family, 11 like to take tea and 14 like coffee. Assume that each one likes at least one of the two drinks. How many like : both tea and coffee?

500 persons takes 25 days to complete a building.How many persons be needed if the same building has to be completed in 10 days ?

Two person can finish the work in 7 days. (i) One of the persons fell ill before the work started . How much time will the other person take to finish the same work. (ii) How many persons will be needed to finish the work in one day.

A tea party is arranged for 16 persons along two sides of a long table with 8 chairs on each side. Four persons wish to sit on one particular and two on the other side. In how many ways can they be seated?