Question

The aquarium has 10 more red fish than blue fish. 60 percent of the fish are red. How many blue fish are in the aquarium? Show your work.

Answer 1

Answer:

20.

Step-by-step explanation:

If 60% of the fish are red, then 40% are blue.

This means that the difference is 20%. As the difference between red and blue fish is given to you as 10, you know that 20% of the total is 10.

This means that 100% is 10 * 5, or 50 fish.

Because 40% of them are blue, 40% of 50 is 20, so there are 20 blue fish.

Answer 2

Answer:

20

Step-by-step explanation:

blue fish is  x

red fish is  (x+10).

Total fish =  x+(x+10)=2x+10  

60%  =  0.6  

So,

0.6=(x+10)/(2x+10)  

⟹6(2x+10)=10(x+10)  

⟹12x+60=10x+100  

⟹2x=40  

⟹x=20  

answer is  20