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Zina [86]
3 years ago
9

Joy is preparing 20 liters of a 25% saline solution. She has only a 40% solution and a 10% solution in her lab. How many liters

of the 40% solution and how many liters of the 10% solution should she mix to make the 25% solution?
Mathematics
2 answers:
olasank [31]3 years ago
5 0

Answer:

10 Liters of 40% solution

Step-by-step explanation:

Tresset [83]3 years ago
3 0

Answer:

10 liters of the 40% solution, and 10 liters of the 10% solution

Step-by-step explanation:

Let us say that x = the liters of the 40% solution, and y = liters of the 10% solution in her lab. We know that Joy is preparing a solution containing a total 20 liters, so x + y = 20. We can respectively create the following system of equations,

x + y = 20,

0.40x + 0.10y = 0.25 ( 20 )

And now we have to solve this system of equations for x and y, the liters of the 40% solution and the liters of the 10% solution,

\begin{bmatrix}x+y=20\\ 0.4x+0.1y=0.25\left(20\right)\end{bmatrix}  ( Substitute x as 20 - y )

0.4\left(20-y\right)+0.1y=0.25\cdot \:20\end{bmatrix} ( Isolate y )

8-0.3y=5 ⇒ 80-3y=50 ⇒ -3y=-30 ⇒ y = 10

x=20-10 = 10 ⇒ x = 10

Therefore, there are 10 liters of both the 40% and 10% solution.

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Change the percentage (60) into a decimal by dividing it over 100:
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A photo album costs $10.49 before discount and tax.
Gemiola [76]

Answer:

Total after tax and discount is $7.78

Step-by-step explanation:

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Step-by-step explanation:

4 0
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Please answer! It would be appreciated if work is also shown!
borishaifa [10]

Quantity of paint left = \frac{389}{480} gallons

Solution:

Quantity of yellow paint = 1\frac{1}{5}=\frac{6}{5} gallons

Quantity of green paint = 1\frac{1}{6}=\frac{7}{6} gallons

Quantity of blue paint = \frac{7}{8} gallons

Quantity of paint used = \frac{3}{4} gallons of each paint

Quantity of paint left = 1-\frac{3}{4}=\frac{1}{4} gallons of each paint

Quantity of paint left = (\frac{6}{5}+\frac{7}{6}+\frac{7}{8})\times\frac{1}{4}

Taking LCM for 5, 6, 8, we get LCM = 120

(\frac{6}{5}+\frac{7}{6}+\frac{7}{8})\times\frac{1}{4}=(\frac{144}{120}+\frac{140}{120}+\frac{105}{120})\times\frac{1}{4}

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Hence, Mark will have \frac{389}{480} gallons of paint left after painting the mural.

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