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Ivan
3 years ago
14

Gabe Amodeo, a nuclear physicist needs 60 liters of a 40% acid solution. He currently has a 20% solution and a 50% solution. How

many liters of each class does he need to make the needed 60 liters of 40% acid solution?
Mathematics
2 answers:
S_A_V [24]3 years ago
8 0
First, let x be the amount of 20% acid solution in liters. With this, 60 - x is the amount of 50% solution. The acid balance before and after mixing becomes,
                          (0.2)(x) + (0.5)(60 - x) = (0.40)(60)
The value of x is 20. Therefore, Gabe needs 20 liters of 20% acid solution and 40 liters of 50% acid solution. 
alukav5142 [94]3 years ago
6 0

The <em><u>correct answer</u></em> is:

He needs 20 liters of the 20% solution and 40 liters of the 50% solution.

Explanation:

Let x represent the amount of the 20% solution and y represent the amount of the 50% solution.

The total amount of acid in the 20% solution would then be 0.2x; the total amount of acid in the 50% solution would be 0.5y.

We know that together, these make 60 liters of a 40% solution; this gives us the equation

0.2x+0.5y = 0.4(60)

Simplifying, we get

0.2x+0.5y = 2.4

We also know that the amounts of the 20% solution and 50% solution together give us 60 liters; this gives us the equation

x+y = 60

We now have a system of equations:

\left \{ {{0.2x+0.5y=24} \atop {x+y=60}} \right.

We will use elimination to solve this.  First we will make the coefficients of y equal; to do this, we will multiply the top equation by 2:

\left \{ {{2(0.2x+0.5y=24)} \atop {x+y=60}} \right. \\\\\left \{ {{0.4x+y=48} \atop {x+y=60}} \right.

We will now cancel the y variables by subtracting the bottom equation:

\left \{ {{0.4x+y=48} \atop {-(x+y=60)}} \right. \\\\-0.6x = -12

Divide both sides by -0.6:

\frac{-0.6x}{-0.6}=\frac{-12}{-0.6}\\\\x=20

Substituting this into the second equation, we have

x+y = 60

20+y = 60

Subtract 20 from each side:

20+y-20 = 60-20

y = 40

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3 years ago
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Answer:

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b) At least what percentage of cars is traveling between 20 and 100 mph?

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c) If a sample of 40 cars is selected at random, estimate the number of cars that are traveling between 40 and 80 mph.

30 cars.

Step-by-step explanation:

We apply Chebyshev's Theorem

This states that:

1) At least 3/4 (75%) of data falls within 2 standard deviations from the mean - between μ – 2σ and μ + 2σ.

2) At least 8/9 (88.89%) of data falls within 3 standard deviations from the mean - between μ - 3σ and μ + 3σ.

3) At least 15/16 (93.75%) of data falls within 4 standard deviations from the mean - between μ - 4σ and μ + 4σ.

From the question, we have:

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Standard deviation of 10 mph.

a) At least what percentage of cars is traveling between 40 and 80 mph?

Applying:

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b) At least what percentage of cars is traveling between 20 and 100 mph?

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