Question

in a group of 50 persos, 25 drink tea, 22 drink coffee and 10 drink coffee and tea both. find the number of persons who don't drink tea, drink only tea, drink neither tea or coffee
$n(u) - n(c)$

Answer 1

no. of people who don't drink tea=50-(no.of people who drink tea)=50-25=25.people who drink only tea =no.of people who drink tea -no .of people who drink both tea and coffee =25-10=15. people who drink neither coffee nor tea =50-(no.of people who drink tea+no. of people who drink coffee- no. of people who drink both tea and coffee)=50-(25+22-10)=50-47+10=23 .Hope it helps you...