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
Nady [450]
3 years ago
9

A chemist mixes a 10% hydrogen peroxide solution with a 25% hydrogen peroxide solution to create 30 liters of a 15% hydrogen per

oxide solution. How many liters of the 10% solution did the chemist use to make the 15% solution?
Mathematics
2 answers:
lapo4ka [179]3 years ago
3 0

20 liters I looked up the answer and did research on how to find it.

guajiro [1.7K]3 years ago
3 0

Answer: 20 liters

Step-by-step explanation:

Let x liter of 10% hydrogen peroxide solution is mixed with y liter of 25% hydrogen peroxide solution to create 30 liters of a 15% hydrogen peroxide solution.

Thus, Total quantity of mixture = 30

⇒ x + y = 30 ---------(1)

And, Total quantity of hydrogen in the mixture is the sum of total quantity of hydrogen in x liter and y liter,

⇒ 10 % of x +25 % of y = 15 % of 30

⇒ 10 x + 25 y = 450

⇒ 2 x + 5 y = 90 ------- (2)

Equation (2) - 2× Equation (1),

⇒ 3 y = 30

⇒ y = 10

Substitute this value in equation (1),

We get,

x + 10 = 30

⇒ x = 20,

Hence, the quantity of 10% solution chemist used to make the 15% solution = x liter = 20 liter.

You might be interested in
Please help with 14 and 15
olchik [2.2K]

n - a number

14. Nine more than the square of a number: n² + 9.

15. Twice the difference between a number and ten: 2(n - 10)

6 0
3 years ago
PLEASE HELP! SO CONFUSED! 25 POINTS!!
MrRa [10]

Answer:

D

Step-by-step explanation:

(f • g)(x)

= f(x) × g(x)

= (x + 4)(3x² - 7)

each term in the second factor is multiplied by each term in the first factor , that is

x(3x² - 7) + 4(3x² - 7) ← distribute both parenthesis

= 3x³ - 7x + 12x² - 28

= 3x³ + 12x² - 7x - 28 ← in standard form

7 0
2 years ago
Use the data set to determine which statements are correct. Check all that apply. 35, 41, 18, 75, 36, 21, 62, 29, 154, 70 The me
stepladder [879]
The median is 38.5

The lower quartile is 29

There is an outlier  (154)

The upper quartile is 70 
and
The interquartile range is 70 - 29  = 41
4 0
3 years ago
Does this look good??????
VLD [36.1K]

Answer:

It should be RGB that's a L

Step-by-step explanation:

8 0
2 years ago
Five times the same of a number.
Tanzania [10]

5 ( x + 3) = 6x - 3

5x + 15 = 6x - 3

x = 18 <====== this is the number

6 0
3 years ago
Other questions:
  • Three nurses attended a seminar for two days. The travel expenses for each nurse were $982. Additional expenses per nurse per da
    15·1 answer
  • Kevin runs 7 miles in 50 minutes. At the same rate, how many miles would he run in 75 minutes?
    7·1 answer
  • What is the sale price on a painting that has a regular price of $1,700 and is on sale for 25% off the regular price ?
    9·1 answer
  • Round 3184.5641 to two decimal places
    7·2 answers
  • A magazine subscription service is having a contest in which the prize is 80,000. if the company receives 1 million entries, wha
    12·1 answer
  • How do I get the square root on a calculator
    11·2 answers
  • I need to find the slope and b <br> Y=mx+b <br> HELP ME
    11·1 answer
  • Y=3x+14<br> 2x-3y=-14<br> Substitution method
    9·2 answers
  • Find the number if:
    9·2 answers
  • Gimme a simple work for brainlist
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!