Question 176246
First we add all known classes:
{{{26+33+28=87}}}
This 87 represents 78% of all students

We want to find x that represents 100% of all students

We can write this relationship as:

{{{87/78 = x/100}}}

We convert percentages to decimal values:

{{{87/0.78 = x/1}}}

{{{x=111.5}}}

Number of total students = 112