Answer:
[tex]\frac{4}{5}[/tex]
Explanation:
Data provided in the question
The ratios are
Second graders to the fourth grader is [tex]\frac{8}{5}[/tex]
First graders to the second grader is [tex]\frac{3}{4}[/tex]
Third graders to the fourth grader is [tex]\frac{3}{2}[/tex]
Now if we multiplying these above three ratios but the last ratio should be reverse
So, it would be
= [tex]\frac{8}{5}\times\frac{3}{4}\times\frac{2}{3}[/tex]
= [tex]\frac{4}{5}[/tex]
Hence, the ratio of first graders to the third graders is [tex]\frac{4}{5}[/tex]
