Answer: 429
Step-by-step explanation:
If all but 1/13 of the students were involved in the evening's activities, that means that 12/13 of the students were involved.
To calculate the total number of students, first you do a simple rule of three to know the number of students that weren't involved in the activities:
If 12/13 of the students represent 396 students, then how many students are 1/13 of the students?
[tex]\frac{\frac{1}{13} *396}{\frac{12}{13} } =\frac{396}{12} =33[/tex]
Then, you add this number to the number of students that were involved in the activities:
[tex]396+33=429[/tex]
So, 429 is the number of students that attend the school.
You can also calculate it directly by doing the following rule of three:
If 12/13 of students represent 396 students, then how many students are 13/13 of the students?
[tex]\frac{\frac{13}{13} *396}{\frac{12}{13} } =\frac{396*13}{12} =\frac{5148}{12} =429[/tex]
Answer:429
Step-by-step explanation: let the total number of students in the elementary school be X
X - X/13 = 396
12X/13=396
X=396/*13/12
X=5148/12
X=429
