in a class of 30 students all of them are either female or smokers. while only 5 are female and smokers. if there are 12 male smokers in the class, then how many female nonsmokers are in the class?
no male non-smokers
17 smokers ... 5 female, 12 male
13 non-smokers, all female
13
To find the number of female nonsmokers in the class, we can use the following steps:
Step 1: Determine the total number of smokers in the class
We are given that there are 12 male smokers and 5 female smokers. So, the total number of smokers in the class is 12 + 5 = 17.
Step 2: Find the number of students who are female or smokers
Since all 30 students in the class are either female or smokers, we can subtract the number of male smokers from the total number of students to find the number of female students. So, 30 - 12 = 18 students are female.
Step 3: Calculate the number of female nonsmokers in the class
To find the number of female nonsmokers, we can subtract the number of female smokers from the total number of female students. So, 18 - 5 = 13 female nonsmokers.
Therefore, there are 13 female nonsmokers in the class.