Answer :
195 ml of 40% solution and 225 ml of 12% solution are needed to make 420 ml of 25% solution.
Number of parts for higher % solution = Desired % in final product - lower % solution: 25 - 12 = 13
Number of parts for lower % solution = Higher % solution - Desired % in final product: 40 - 25 = 15
Total the number of pieces by adding all the individual part counts: total parts: 15 + 13 = 28
To calculate ml/part, divide the final volume of the desired product by the total number of parts: 420/28 parts = 15 ml/part
To determine how much of each solution you need to combine to produce the desired outcome, multiply the number of parts for each percent solution by the ml/part:
15 ml/part x 13 parts = 195 ml of 40% solution
15 ml/part x 15 parts = 225 ml of 12% solution
195 ml of 40% solution and 225 ml of 12% solution are needed to make 420 ml of 25% solution.
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