500
What is Becky is mixing a 10% saline solution with an 18% saline solution. She would like to obtain a 20 gram mixture that is 13% saline. How many grams of each solution should she use to obtain the desired mixture?
12.5 grams of 10% solution, 7.5 grams of 18% solution
12.5 grams of 10% solution, 7.5 grams of 18% solution