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
Rom4ik [11]
2 years ago
12

Suppose a lab needs to make 400 liters of a 39% acid solution, but the only solutions available to the lab are 20% acid and 50%

acid. What system of equations can be used to find the number of liters of each solution that should be mixed to make the 39% solution? Let c represent the number of liters of 20% acid solution and let d represent the number of liters of 50% acid solution.
Mathematics
1 answer:
Alekssandra [29.7K]2 years ago
3 0
Mixture problem.
Ratio of 20% : 50% acids
=50-39 : 39-20
=11:19
total volume
=400L
vol. of 20% acid=400*(11/(11+19)=400*(11/30)=146.667 L
vol. of 50% acid=400*(19/(11+19)=253.333 L

Alternatively, use c=volume of 20%, d=vol of 50%
then
0.2c+0.5d=400*0.39
Since c+d=400, we have
0.2c+0.5(400-c)=400*0.39=156
solve for c:
0.3c=44
c=146.667 and d=400-c=253.333  as before.
You might be interested in
- 7x + 5(2x - 1) = -20​
kramer

Answer:

x= -5

Step-by-step explanation:

-7x + 5(2x - 1) = -20

-7x + 10x - 5 = -20

3x -5 = -20

3x = -15

x = -5

8 0
3 years ago
Read 2 more answers
4.3<br> Rounding to the nearest whole number
Roman55 [17]
1.7=2
8.1=8
6.9=7
4.3=4
Hope this helps
7 0
2 years ago
Read 2 more answers
Arrange the expressions in increasing order of their values.
Arada [10]

Answer:

10^0*10^1-1,

10^0*10^1*1^10,

10^0+10^1*1^10,10^0+10^1+1^10

Step-by-step explanation:

3 0
2 years ago
A bag contains 12 counters. 7 of them are white. A counter is taken at random and not replaced. A second counter is taken out of
grandymaker [24]
<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ First calculate how many counters are 'not white'

12 - 7 = 5

We have 5 counters that are 'not white'

The probability of taking a white counter the first time is 7/12

For the next pick, there would be 1 less of the total counters as it is not being replaced

The probability of then taking a 'not white' counter is 5/11

The other way you could still get one white counter is:

The first counter (non white) probability would be 5/12

The second counter (white) probability would be 7/11

Multiply these values:

7/12 x 5/11 = 35/132

5/12 x 7/11 = 35/132

Add these two values together:

35/132 + 35/132 = 70/132

Your answer is 70/132

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

8 0
3 years ago
What is the simplified result of following the steps below in order?
Keith_Richards [23]
(5y+2x)*3+(x+y)=15y+6x-x-y=5x+14y
3 0
2 years ago
Other questions:
  • Every 4th visitor to a museum gets a free bumper sticker.Every 10th visitor to that museum gets a free key chain.Which visitor n
    14·2 answers
  • A(y+c) =b(y-c) solve for y
    12·1 answer
  • Exit a spinner used for a game is divided into 3 sections: yellow, green, and orange. janie spins the spinner 20 times. the spin
    10·2 answers
  • Solve this equation. 5n+7=7(n+1)-2n
    9·2 answers
  • TheStudent Government buys sweatshirts for $10 and sells them for $25. Find the percent of increase.
    10·1 answer
  • Heeeelp plsssssss :)
    12·2 answers
  • If there are 36 students and the ratio of girls to boys 5:4 how many girls and boys would there be​
    5·1 answer
  • A set of middle school student heights are normally distributed with a mean of 150150150 centimeters and a standard deviation of
    10·1 answer
  • The measures of the angles of a triangle are shown in the figure below. Solve for x.
    14·1 answer
  • What are x and y intercepts of the<br> equation 3y + 2x = 6?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!