Question

Suppose 36 student sign up for classes during an orientation session Fi exactly 22 of them signed up for chemistry and exactly 18 of them signed up for English. How many of them signed up for both chemistry and English? How many of them signed up for chemistry only how many of them signed up for English only

Answer 1

Answer:

total No. students = 36

No. of students signed up for chemistry = 22

No. of students signed up for English =18

let the no. of students signed up for both=x

x students are in chemistry and English .That means x comes 2 times when we add both so 2=+18-x=36

removing x once from the sum (22+18) is equal to 36

40-x=36

x=4

so, 4 students signed up for both subjects