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

Question

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

what are you asked at the end of the question?

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

i think it is ;;