A laboratory test for gastric acidity calls for 0.1 NaOH. Prepare 40.0mL of a 10X stock solution of this reagent using two NaOH solutions, one labeled 20% and the other 0.75N. How much 20% NaOH and 0.75N NaOH must be mixed together to produce 40.0mL of 10X stock?
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