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
Sever21 [200]
3 years ago
8

A scientist wants a 66 ounce saline solution with concentration 12% . She has concentrations of 4% and 15% . How much of each so

lution must she use to get the desired concentration?
Mathematics
1 answer:
Bess [88]3 years ago
6 0
Let x and y represent the measure in ounces of the two given saline solutions.  We are mixing these two together, so x + y = 66 ounces.

The amount of the 4% solution to be used is 0.04x, and that of the 15% solution is 0.15y. 

This results in the equation .04x + 0.15y = 66(0.12).

Multiply both sides by 100 to remove the decimal fractions.  Then

4x + 15y = 66(12).  Now eliminate the variable x by recalling that x + y = 66 ounces, so that x = 66 - y.

Substituting, 4(66 - y) + 15y = 66(12)
Expanding, 264 - 4y + 15 y = 792
combining like terms:    11y = 528

Solving for y:  y = 528/11 = 48.  Then x = 66 - 48 = 18.

Use 48 ounces of the 15% solution and 18 ounces of the 4% solution to obtain 66 ounces of a 12% solution.
You might be interested in
The formula for the perimeter of a rectangle can be written as P= 2(l+w). Solve the formula for the length l.
Ronch [10]

Undo what is done to l. l has w added and the sum multiplied by 2, so divide by 2 and subtract w:

... l = P/2 -w

5 0
3 years ago
What is the domain of this graph​
Naddik [55]

Answer:

A

Step-by-step explanation:

b is the range

8 0
2 years ago
a computer and printer a totoal cost $1132 the cost of the computer is three times the cost of the ptinter
zavuch27 [327]
Use a system of equations

C+P=1132
3P=C

Substitute C in first equation as
3P+P=1132
Simplify
4P=1132
Solve
P=1132/4
P=283

NOW SOLVE FOR C SUBSTITUTING P VALUE IN FIRST EQUATION

C+283=1132
C=1132-283
C=849


Printer = 283$
Computer = 849$
3 0
2 years ago
Nut C fits on Bolt C. Nut B fits on Bolt B. Nut A fits on Bolt A. Bolt C is larger than Bolt B. Bolt A and Bolt B are exactly th
Alborosie

Answer:

Bolt A will fit Nut A and Nut B

Step-by-step explanation:

We have the following statements:

Nut C fits on Bolt C.

Nut B fits on Bolt B.

Nut A fits on Bolt A.

Bolt C is larger than Bolt B.

Bolt A and Bolt B are exactly the same.

Then we can say that Bolt A will fit Nut A and Nut B...

4 0
3 years ago
Three angles of a quadrilateral are 75°, 90° and 75°. What is the measure of the fourth angle?
Sergio039 [100]

the inside of quadrilateral is always 360°.So add 75°,90° and 75° and then subyaract from360°.

x+75°+75°+90°=360

×+240°=360°

x=360°-240°

x=120°

4 0
3 years ago
Other questions:
  • PLEASE HELP simple geometry problem
    9·1 answer
  • What is the diameter of a circle whose circumference is 62.8 mm? Use 3.14 for π.
    14·1 answer
  • Randy made 5 liters of punch for his party. His friends drank 4,500 mL. How many milliliters are left at the end of the party?
    5·1 answer
  • Help please? 10 points. Correctly
    10·1 answer
  • 1). Which statement correctly compares the numbers? *
    9·1 answer
  • What tools did the Greeks not use in the geometric constructions?
    10·2 answers
  • 5. Brianna traveled 500 miles in 8.25 hours. How fast was she traveling? Round to the nearest tenth.
    13·1 answer
  • Which of the following Expressions has a coefficient of 10 and a constant of 5?​
    15·2 answers
  • 9. A building 62 feet tall casts a shadow 21 meters long. At what angle is the sun shining on the building?
    6·2 answers
  • Please help<br><br> Select the expressions equivalent to 18 + 3r.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!