SOLUTION: A chemist needs 120 milliliters of a 60% solution but has only 44% and 92% solutions available how many milliliters of each should be mixed to get the desired solution?

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Let X be the volume of 44% solution and Y the volume for 92% solution,
The total volume equation is
1.
The total concentration equation is
2.
Multiply both sides by 100 to get rid of decimals,
2.
Use eq. 1 to get X in terms of Y,
1.

Now substitute into eq. 2,
2.




From eq. 1,



Use 80 ml of 44% solution and 40 ml of 92% solution.