Answer:
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.