A histologist has 75% alcohol ready for use, but needs 30% alcohol for the procedure she wants to perform. How many mL of the 75% solution will she need to dilute with water to make 500 mL of 30% alcohol?

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A histologist has 75% alcohol ready for use, but needs 30% alcohol for the procedure she wants to perform. How many mL of the 75% solution will she need to dilute with water to make 500 mL of 30% alcohol?

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