Question

Elle went to pet smart and bought 4 gold fish and three turtles for $28. later the day, warren went to Petsmart and bought six goldfish in one turtle for $10 how much does one goldfish cost

Answer 1

It would cost 40$ because you are doing 10 times 4

Answer 2

So from what i am getting from this info you are saying that the six gold fish were 10.00$ 

so if what i am seeing is write you do 10 divided by 6 which is 1.70. 
so each gold fish is 1.70$.