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:
![(150)/(200)=(3)/(4)](https://img.qammunity.org/2019/formulas/sat/high-school/bdzzz8q3nibnaotib55azivramk3hdz2k6.png)
Therefore, the ratio of male fish with egg cells to male fish without egg cells in the river is
![(3)/(4)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/eulje16nvg9cdod3mppp9iwzntxa82tvs3.png)