SOLUTION: A lab technician needs 35 mL of 15% base solution for a certain experiment, but she has only 10% solution and 20% solution. How many milliliters of the 10% and the 20% solutions sh
Question 1158713: A lab technician needs 35 mL of 15% base solution for a certain experiment, but she has only 10% solution and 20% solution. How many milliliters of the 10% and the 20% solutions should she mix to get what she needs?
The technician will need mL of the 10% solution and mL of 20% solution Found 2 solutions by greenestamps, ikleyn:Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
Common sense should tell us that, since 15% is halfway between 10% and 20%, the mixture should use equal amounts of the 10% and 20% solutions.
ANSWER: 17.5 mL of each
Algebraically, if required....
x = mL of 10% solution
35-x = mL of 20% solution
The total amount in the two ingredients is 15% of the total 35 mL:
Solve using basic algebra; of course your answer should be 17.5 mL of each.
Since 15% is exactly half way between the 10% and 20%,
he (or she) needs equal amounts of each original ingredients.
ANSWER. 17.5 mL of each original ingredients.
------------
Any housewife will say it without any calculations.