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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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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?
Please select the single best answer
300 mL
200 mL
20 mL
75 mL
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