in a recent survey of 400 students of noun, 100 were listed as smokers and 150 as chewers of gum, 75 were listed for both smoking and chewers of gum. How many students are either smokers nor gum chewers.

Answer 1

Don't you mean "NEITHER smokers nor gum chewers?"

Sra

Answer 2

in a recent survey of 400 students of noun, 100 were listed as smokers and 150 as chewers of gum, 75 were listed for both smoking and chewers of gum. How many students are neither smokers nor gum chewers.

Answer 3

The total number of smokers is 100, and 75 of them chew gum. Therefore, 25 of the smokers do not chew gum.

The total number of gum chewers is 150, and 75 of them smoke. Therefore, 75 of the gum chewers do not smoke.

Now, we have
75 smokers & gum chewers
25 smokers
75 gum chewers

For a total of 175 students who either smoke or chew gum.

Subtract that from 400 to find the number of students who do neither.

400 - 175 = 225