PLZ HELP ME IT IS VERY URGENT THERE ARE three QUESTIONS PLZ ANSWER THEM!!
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Let be the volume of 20% solution,
the volume of the 60% solution. We want a total volume of 400 mL in the final mixture, so
Each mL of either solution will contribute a corresponding concentration, and in the final mixture we want the 400 mL to have a 40% concentration, which means we should also have
Solve the system and we get .
Assignment:
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Answer:
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Explanation:
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[ Step One ] Rewrite
[ Step Two ] Apply perfect square formula
Note: Perfect Square Formula:
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