natalie2sheffield
23.02.2021 •
Mathematics
Dianne needs 72 mL of a 23% acid solution for a science experiment. She has available a 12% solution and a 30% solution. How many mL of the 12% solution and how many mL of the 30% solution should she mix to make the 23% solution?
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Ответ:
9 because 3:7 means that for every 3 lemons she buys there's 7 apples being bought so you'd add 3+7 until it equals 30 and that's your answer which here is 9 Lemons.