Question

Girls in science class account for one-third of the total number of students in their 3rd period class. 3 girls are absent today. Find the total number of students in the class if four girls attended class today.

Answer 1

See Explanation

Explanation:

The question isn't clear enough. However, I'll solve for the total number of students in science class and I'll.also solve for the total number of students present in class.

Given

Proportion of girls = ⅓

Number of girls absent = 3

Number of girls present = 4

Required

Find the total number of students

If 3 girls were absent and 4 were present, then there are total of 7 girls in science class.

Let the number of students in the class be represented by y.

⅓ of the total number of students are girls;

This means

⅓ of y = 7

⅓ * y = 7

Multiply both sides by 3

3 * ⅓ * y = 3 * 7

y = 3 * 7

y = 21.

Hence, the total number of students in science class is 21

Recall that 3 girls are absent;

This means that 21 - 3 are presently in the class.

21 - 3 = 18.

Hence, 18 students are presently in class.