Answer:
Salma should land her spinner on a 1, 2 or 3 about 600 times.
Explanation:
Since Salma has a spinner divided into 8 equal sections, and each section is bered with a number 1 through 8, and Salma is going to spin the spinner 1600 times, to determine, theoretically, how many times should she land on a 1, 2, 3 the following calculations must be performed: 
 
8 = 100 
3 = X 
3 x 100/8 = X 
300/8 = X 
37.5 = X 
 
100 = 1600 
37.5 = X 
37.5 x 1600/100 = X 
60000/100 = X 
600 = X 
 
Therefore, Salma should land her spinner on a 1, 2 or 3 about 600 times.