A chemist needs to mix an 20% acid solution with a 50% acid solution to obtain 15 liters of a 34% acid solution. How many liters of each of the acid solutions must be used?

Answers

Answer 1

Answer:

This question is based on the system of equation. Therefore, the 8 litres of the 20% and 7 liters of the 50% solution.

Given:

A chemist needs to mix an 20% acid solution with a 50% acid solution to obtain 15 liters of a 34% acid solution.

We need to determined the numbers of liters of each of the acid solutions must be used.

According to the question,

Let the number of liters be x for 20% and y for the 50% solution.

Then,

⇒ 0.2x + 0.5y = 15 $*$ 0.34

⇒ 0.2x + 0.5y = 5.1

Also we have:

Multiply the first equation by -2:

⇒ x + y = 15

Adding these last 2 equations:

⇒ -0.4x - y = -10.2

⇒ 0.6x = 4.8

⇒ x = 4.8 / 0.6

⇒ x = 8 and y = 15 - 8 = 7 .

Therefore, the 8 liters of the 20% and 7 liters of the 50% solution acid solutions must be used.

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Answer 2

Answer:

Answer:

8 litres of the 20% and

7 litres of the 50% solution.

Step-by-step explanation:

Let the number of litres be x for 20% and y for the 50% solution. Then

0.2x + 0.5y = 15*0.34

0.2x + 0.5y = 5.1 Also we have:

x + y = 15 Multiply the first equation by -2:

-0.4x - y = -10.2 Adding these last 2 equations:

0.6x = 4.8

x = 4.8 / 0.6

x = 8.

and y = 15 - 8 = 7 .

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I need help for my Maths Assessment! URGENT!! So, The topic is about Observed, Relative and Expected frequencies. I'm stuck on some of the questions and I don't know what to do!! Please help me!! I have to do the assessment tomorrow! If you answer, I'll pick you as the brainliest and give you a thank you!

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5a) The expected frequency for rolling a difference of 1 and 3 is larger than the observed frequency, but the observed frequency for rolling a difference of 2,4 and 5 is larger than the expected frequency

7)Increase the amount of rolls so the percentage of anomalies will be smaller

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GIMME BRAINLIEST

I am answering because I want that other person to get the brainiest so here is the other answer that is not really an answer.

You are asked to draw a triangle using three of the following angles: 0°, 30°, 45°, 55°, 60°, 80°, 90°, 105°. Which triangle cannot exist?A) 30°, 60°, 90°
B) 45°, 55°, 80°
C) 30°, 45°, 105°
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Answers

Answer:

Step-by-step explanation:

When you add all the the angles of a triangle, they will end up to be exactly 180 degree. When you add the three numbers A, B, and C end up with 180 degree, but D end up with 130 degree, therefore, D is the triangle that cannot exist.

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4/10 × 6/8 = must reduce answer

Answers

4/10×6/8=24/80=24÷8/80÷8=3/10 Hope it helps^^^^

4/10 x 6/8 = 24/80 = 3/10 is the answer !

hope I helped :)!

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Answers

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An NBA game is 48 min long.If Lebron James ate a Big Mac Extra Value Meal ( that is 1360 calories) before a game, would he burn off all the calories by the end of the game? if not,how much longer would he have to play

Answers

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Answers

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