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andrewrangel63
31.07.2019 •
Mathematics
Apharmacist has an 18% alcohol solution. how much of this solution and how much water must be mixed together to make 10 liters of a 12% alcohol solution?
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Ответ:
Step-by-step explanation:
The 18% solution added to the water is equal to the 10 liters of 12% solution.
Let's say that the amount of 18% solution is x
18% of x = 0.18x
Let's say that the amount of water is 10-x
Because there is no alcohol in water, it will be 0(10-x), or just 0
0.18x + 0 = 10•0.12
0.18x = 1.2
x =![6\frac{2}{3}](/tpl/images/0154/3423/e931f.png)
10 -
= ![3\frac{1}{3}](/tpl/images/0154/3423/85f35.png)
Ответ:
8.04
Step-by-step explanation:
Solution 1
x= r- 4.5= 25.2/2 - 4.5= 8.1
Solution 2
x= √(25.2/2)² - 9.7²= √64.67= 8.04
refer to attachment