What is the 6th number that needs to be added to make the mean 12?

7, 16, 11, 12, 10,

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Assemble the proof by dragging tiles to the statements and reasons column

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