1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Morgarella [4.7K]
3 years ago
13

scientist needs 120 liters of a 20% acid solution for an experiment. The lab has available a 25% and a 10% solution. How many li

ters of the 25% and how many liters of the 10% solutions should the scientist mix to make the 20% solution?
Mathematics
1 answer:
sattari [20]3 years ago
4 0

Answer:

The scientist needs 80 liters of 25% solution and 40 liters of 10% solution.

Step-by-step explanation:

If x is the liters of 25% solution, and y is the liters of 10% solution, then:

x + y = 120

0.25x + 0.10y = 0.20(120)

Solve the system of equations using substitution or elimination.  Using substitution:

0.25x + 0.10(120 − x) = 0.20(120)

0.25x + 12 − 0.10x = 24

0.15x = 12

x = 80

y = 40

The scientist needs 80 liters of 25% solution and 40 liters of 10% solution.

You might be interested in
HELLLLPPPPPPPP☝️☝️☝️☝️☝️!!!!
8090 [49]
Money collected independent
tickets sold dependent
5 0
3 years ago
A rectangle has an area of 36 square units. As the length and the width change, what do you know about their product? Is this le
m_a_m_a [10]
Area = 36 = length*width

Then, while the area is constant the product length*width is constant.

Length and area are inversely related.

That means that to keep the same product (area), length vary in inverse proportion to width.

If you increase length, widht has to decrease to satisfy this relation:

width = 36/length

Of course, you can also say: length = 36 / width.
5 0
3 years ago
1)-11 + __ = 15<br> I really need help
katrin [286]

Answer:

26

Step-by-step explanation: You basically add 11 them you are at 0 then add 15 to that number and you get 11+15=26 thats ur answer

6 0
3 years ago
Read 2 more answers
What is the solution to the system x+y=10 3y=-3x+30<br><br> PLEASE helpppp
choli [55]

Answer:

Step-by-step explanation:

x+y=10

x=10-y

x=10-5

x=5

3y= -3x+30

3(10-y)= -3(10-y)+30

30-3y= -30+3y+30

30+30-30=6y

30=6y

y=5

6 0
3 years ago
Is there a easy way to subtract fractions with unlike deiomaters
Angelina_Jolie [31]

Answer:

Yes

Step-by-step explanation:

It's just like adding fractions where you have to find the common denominator so the fractions can be subtracted.

<u>Example</u>

<u />\displaystyle \frac{1}{2}-\frac{1}{3}=\frac{1*3}{2*3}-\frac{2*1}{2*3}=\frac{3}{6}-\frac{2}{6}=\frac{1}{6}

8 0
2 years ago
Other questions:
  • Find the height of the giraffe in the diagram below​
    9·2 answers
  • Clara is growing her hair out and wants it to be no longer than 15 cm but more than 11 cm. Her hair is 7 cm right now and grows
    5·1 answer
  • If the vertex of a parabola is (0, 3), what is the axis of symmetry
    15·1 answer
  • Solve for x.<br> i need help
    9·1 answer
  • What is the answer to 56 x 2 12 =
    10·2 answers
  • Juan cut StartFraction 5 Over 12 EndFraction of a yard of cloth into 5 pieces of equal length. What was the length of each piece
    7·1 answer
  • Order the fractions from least, to greatest, 3 6 4 5 5 12​
    5·1 answer
  • The ratio of the measures of the angles of a triangle is 7:5:8. What is the measure of the largest angle
    11·1 answer
  • Give exact values. No decimals allowed!
    11·1 answer
  • A graph shows the horizontal axis numbered 4 to 16 and the vertical axis numbered 4 to 12. points and a line show an upward tren
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!