How many milliliters of a 40% solution and a 12% solution are needed to make 420 ml of 25% solution?
195 ml of 40% solution and 225 ml of 12% solution
245 ml of 40% solution and 175 ml of 12% solution
100 ml of 40% solution and 320 ml of 12% solution
295 ml of 40% solution and 125 ml of 12% solution
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