The ______ is the control center of the nervous system. It sends and receives signals to and from the entire body.
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I would double check if I were you! Hope this helps!
x = volume of 10% solution to use in the mixture
y = volume of 25% solution to use
She wants a 200 mL solution, so x + y = 200.
The first solution contributes 0.10x mL of alcohol, while the second contributes 0.25y mL. Together, they make a solution with 0.20(x + y) = 0.20(200) = 40 mL of alcohol.