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marissa [1.9K]
3 years ago
7

Consider the variable race. What frequency of observations are Black and what frequency are Latino? A. 7 are black and 5 are Lat

ino B.7 are Black and 4 are Latino C. 4 are black and 8 are latino D.8 are black and 4 are Latino E. 1 is black and 1 is Latino
Mathematics
1 answer:
AURORKA [14]3 years ago
8 0

Answer:

The answer is 8 are Black and 4 are Latino

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(4^2)+8

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Simplify: –4(x – 5) + 3(a – 7)
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-4 (x - 5) + 3 (a - 7)

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A cylinder has a diameter of 24 inches. If its height is half its radlus, what is the volume of the cylinder in cubic Inches?
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about 2714.34 in^3

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to arrive at 2000 liters of 60% saline solution the attendant has to mix a 90% and a 40% saline solution. How many liters of eac
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Answer:

<u>800 liters</u> of 90% saline solution and <u>1200 liters</u> of 40% saline solution should be used.

Step-by-step explanation:

Given:

At 2000 liters of 60% saline solution the attendant has to mix a 90% and a 40% saline solution.

Now, to find the number of liters of saline solution each should be used.

<u><em>Let the liters of 90% saline solution mix be </em></u>x.<u><em /></u>

<u><em>And let the liters of 40% saline solution mix be</em></u> y.

So, the total number of liters:

x+y=2000.

y=2000-x\ \ \ ....(1)

Now, the total percentage of saline solution:

90\%\ of\ x+40\%\ of\ y=60\%\ of\ 2000

\frac{90}{100}\times x+\frac{40}{100}\times y=\frac{60}{100}\times 2000

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Substituting the value of y from equation (1) we get:

0.9x+0.4(2000-x)=1200

0.9x+800-0.4x=1200

0.5x+800=1200

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0.5x=400

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<u>Thus, the liters of 40% saline solution = 1200.</u>

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