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
Is 4 acres for 800 plants a rate it unit rate?
Levart [38]

Answer:

yes, put it in this perspective, for every 4 acres, 800 plant are planted

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Find the measure of the indicated angle below
Norma-Jean [14]

Answer:

The measure of x is 70\°

Step-by-step explanation:

we know that

The formula to calculate the sum of the internal angles of a polygon is equal to

S=(n-2)*180\°

where

n is the number of sides

In this problem we have

n=9\ sides

substitute

S=(9-2)*180\°=1,260\°

Find the measure of each internal angle

Divide the sum of the internal angles by the number of sides

1,260\°/9=140\°

The value of x is half the measure of internal angle

so

x=140\°/2=70\°

8 0
3 years ago
What is the volume?
Alina [70]

Answer:

27 cubic unit

Step-by-step explanation:

as 27 is the product of three dimensions 3×3×3

5 0
2 years ago
A recent national survey indicated that 73 percent of respondents try to include locally grown foods in their diets. A 95 percen
lilavasa [31]

Answer:

Correct option is:

"Less than 75% of all people in the country try to include locally grown foods in their diets."

Step-by-step explanation:

A hypothesis for the proportion of people who include locally grown foods in their diets can be defined as:

<em>H₀</em>: The proportion of people who include locally grown foods in their diets is <em>p</em>.

<em>Hₐ</em>: The proportion of people who include locally grown foods in their diets is difference from <em>p</em>.

The decision rule can be based on the 95% confidence interval.

If the confidence interval consists the hypothetical value of the true proportion then the null hypothesis will be accepted or else the null hypothesis will be rejected.

The 95% confidence interval for the proportion of all people in the country who try to include locally grown foods in their diets is given as (0.70, 0.76).

This interval implies that there is 0.95 probability that the true proportion of people who include locally grown foods in their diets is between 70% and 76%.

Assuming that the claim made was supported by the 95% confidence interval.

The claim should be:

Less than 75% of all people in the country try to include locally grown foods in their diets.

Because the 95% confidence interval defines the range of the true proportion as 70% to 76%. Most of the values are below 75%.

Thus, the correct option is:

"Less than 75% of all people in the country try to include locally grown foods in their diets."

3 0
3 years ago
Read 2 more answers
Use benchmark fractions to compare 2/9 and 5/6. Part A Which of the following is a benchmark fraction Heather can use to compare
Dimas [21]

Answer:

30

Step-by-step explanation:

2/9 and 5/6 have a lcm of 30.

5 0
3 years ago
Read 2 more answers
Other questions:
  • ??? Really need help
    11·1 answer
  • Write a multiplication sentence to describe each model
    14·1 answer
  • Answer correctly plz
    5·2 answers
  • A patrolman spends 25% every day completing paperwork. The patrolman’s shift each day is 8 hours. How much of his time does he s
    11·1 answer
  • 40% of one spig is a spoog. 25% of a speeg is a spoog. 70% of a speeg is a spug. What percent of 1 spig is 5 spugs
    14·1 answer
  • A cone with base radius 7 cm and a volume of 308cm^3 find the vertical height of the cone​
    9·1 answer
  • Ben is 444 times as old as Ishaan. 666 years ago, Ben was 666 times as old as Ishaan.
    13·1 answer
  • I need help and really appreciate it if someone could help
    11·1 answer
  • 7 Jill makes purses and backpacks. To make each purse,
    7·1 answer
  • Molly has biweekly gross earnings of $839. 52. By claiming 1 more withholding allowance, Molly would have $16 more in her take h
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!