Solution:
We are given:
Number of male fishes surveyed by Elena in a river = 350
Number of male fishes with eggs growing inside them = 150
Therefore the number of male fishes without eggs = 350 - 150 = 200
Now the ratio of male fish with egg cells to male fish without egg cells in the river is:
[tex]\frac{150}{200}=\frac{3}{4}[/tex]
Therefore, the ratio of male fish with egg cells to male fish without egg cells in the river is [tex]\frac{3}{4}[/tex]
