Collegiate maths like multivariable are greatly underrepresented on Khan Academy and will probably remain that way as long as the site is being pushed as a replacement for common middle school curr...

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Since it's a pre-algebra class and you have the option of using KA full-time, I'm going to assume it's a middle school or high school class and thus that normal grade distributions aren't really ne...

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0.5% of a 30 mL solution would be 0.15 mL of ingredient. Then we have to find the quantity of 6% solution that has 0.15 mL of ingredient. (qty of 6% solution)(6%) = 0.15 mL divide both sides by 6%...

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3. if 30 mL of a 0.5 % solution is being prepared from a 6% solution, ___ mL of the 6% solution will be used?