aaronpmoore4137
25.06.2019 •
Mathematics
You need a 15% alcohol solution. on hand, you have a 210 ml of a 35% alcohol mixture. how much pure water will you need to add to obtain the desired solution?
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Ответ:
280 mL
Step-by-step explanation:
If x is the amount of 35% solution and y is the amount of pure water, then:
0.15 = (0.35x + 0y) / (x + y)
0.15 = (0.35x) / (x + y)
Given that x = 210 mL:
0.15 = (0.35×210) / (210 + y)
210 + y = 490
y = 280
Ответ:
Lol
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