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Sergio [31]
2 years ago
5

How many liters each of a 50% acid solution and a 75% acid solution must be used to produce 90 liters of a 60% acid solution? (R

ound to two decimal places if necessary.)
SAT
1 answer:
elena-14-01-66 [18.8K]2 years ago
8 0

The numbers of liters that is needed is 40 liters of 25% solution and 40 liters of 65% solution.

<h3>What is the litters about?</h3>

Note that:

We take x = volume of 25% solution.

We take y = volume of 65% solution.

So, Equation of total volume:

x + y = 80

Hence the equation of amount of acid:

0.25x + 0.65y = 0.45(80)

0.25x + 0.65y = 36

Solve x + y = 80 for x.

x = 80 - y

Then Substitute into the second equation.

0.25(80 - y) + 0.65y = 36

20 - 0.25y + 0.65y = 36

0.4y = 16

y = 40

x + y = 80

x + 40 = 80

x = 40

Therefore, The numbers of liters that is needed is 40 liters of 25% solution and 40 liters of 65% solution.

Learn more about liters from

brainly.com/question/17435066

#SPJ1

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The value of the limit expression \lim_{x \to 3} \sqrt{x^2 + 7} + 5 is 9, and it means that the function approaches 9, as x approaches 3.

<h3>How to evaluate the limit?</h3>

The limit expression is given as:

\lim_{x \to 3} \sqrt{x^2 + 7} + 5

This means that we determine the value of the function as x approaches 3.

So, we have:

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