Answer:
The total number of students that ate lunch are 300 .
Step-by-step explanation:
Formula
\(Percentage = \frac{Part\ value\times 100}{Total\ value}\)
As given
There are 4 lunch choices in a school cafeteria: Salad, Pizza, Spaghetti, and Sub Sandwiches.
The percentage of students that chose salad is 15%.
If 45 students chose salad.
Here
Percentage = 15%
Part value = 45
Put in the formula
\(15 = \frac{45\times 100}{Total\ value}\)
\(Total\ value= \frac{4500}{15}\)
\(Total\ value= 300\)
Therefore the total number of students that ate lunch are 300 .