## anonymous one year ago can anyone tell me how to solve this problem? i cant understand what is it means.... Rosamaria is setting up a 20 gallon saltwater fish tank that needs to have a salt content of 3.5%. If she has 2.5% salt and water that has 3.7% salt, how many gallons of the water with 3.7% salt content should she use

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1. anonymous

lets call the amount of $$3.7\%$$ salt water $$x$$ since that is what you are trying to find

2. anonymous

and since the total is $$20$$ that means the amount of $$2.5\%$$ solution is $$20-x$$

3. anonymous

wait, i cant understand why amount of 3.7% salt water is x

4. anonymous

the total amount of salt you want is $$3.5\%$$ of $$20$$ which is $$.035\times 20=.7$$ ok lets back up

5. anonymous

what are you asked at the end of the question?

6. anonymous

i mean that what is the thing that the problem is asking about

7. anonymous

how many gallons of the water with 3.7% salt content should she use? is the question right?

8. anonymous

i think it is ;;