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
TEA [102]
2 years ago
12

A chemist needs 90 milliliters of a 25% solution but has only 16% and 43% solutions available

Mathematics
1 answer:
Stels [109]2 years ago
4 0
Let f be amount of 43% and  s be amount of 16%...

s+f=90, f=90-s

(.16s+.43f)/90=.25  using f found above we get:

(.16s+.43(90-s))/90=.25

.16s+38.7-.43s=22.5

-.27s=-16.2

s=60, and since  f=90-s, f=30

So the chemist will need to mix 60ml of 16% solution with 30ml of 43% solution to create 90ml of a 25% solution.








You might be interested in
Deacon wants to order DVDs. Each DVD costs $12.95, and he must pay a shipping and handling fee of $4.95 for the entire order. De
eduard

Answer:

12.95a + 4.95 ≤ 75

Step-by-step explanation:

Given:

Cost of each DVD = $12.95

Total shipping fee = $4.95

Total amount as gift card = $75

Find;

Inequality

Computation:

Assume;

Number of DVD he purchase = a

So,

Total amount as gift card ≥ (Cost of each DVD)(Number of DVD he purchase ) + Total shipping fee

75 ≥ (12.95)(a) + 4.95

12.95a + 4.95 ≤ 75

6 0
2 years ago
The sum of two numbers is 85. If four times the smaller number is subtracted from the larger number, the result is 5. Find the t
Cerrena [4.2K]

Answer:

the larger number is 69

the smaller number is 16

Step-by-step explanation:

x is the smaller number

y is the larger number

x + y = 85

y - 4x = 5

y = 5 + 4x

x + 5 + 4x = 85

5x = 80

x = 16

y = 69

5 0
2 years ago
Find the area of the circle with a circumference of 50.24 units help me plz
swat32
Circumference of a circle=diameter times pi

50.24=d(3.14)
d=16

radius is half of diameter so radius is 8

Area of a circle=pi(r^2)

(3.14)(8^2)=(3.14)(64)=200.96
4 0
3 years ago
After a new $28,000 car is driven off the lot, it begins to depreciate at a rate of 18.9% annually.
Rainbow [258]

Answer:

2

Step-by-step explanation:

We get 0.811 as our depreciating value because we take 18.9% and turn it into a decimal. Then, we subtract that from 1. If we did 0.189 instead, it would depreciate at a rate of 81.1% annually.

5 0
2 years ago
Jeremy’s pay started at a $500 per week. Every year his pay will increase by $25 per week. Write an equation that models his wee
algol [13]

Answer:

W = 500 + 25x

Step-by-step explanation:

Jeremy’s pay started at $500 per week. Every year his pay will increase by $25 per week.

Now, after x years his pay per week will increase by $(25x).

Therefore, if we model the weekly payment of Jeremy by an equation, then it will be given by

W = 500 + 25x

where W is his weekly payment after x years. (Answer)

8 0
3 years ago
Other questions:
  • PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!! I CANNOT RETAKE THIS!!
    13·1 answer
  • Aidan is 68 inches tall. The average height of students in his class is 65 inches with a standard deviation of 3.6 inches. What
    6·1 answer
  • Last year, sales at Company X were 10% greater in February than in January, 15% less in March than in Feb, 20% greater in April
    9·1 answer
  • Can someone help? using soh cah toa find length of OP round to the nearest tenth of a foot?
    11·2 answers
  • When 5 is subtracted from the square of a number, the result is 4 times the number. Find the negative solution.
    10·1 answer
  • Let A = {15, 25, 35, 45, 55, 65} and B = {25, 45, 65}. What is A ∩ B?
    7·1 answer
  • Find the distance between the pair of points<br><br> (0,0)(6,8)
    5·1 answer
  • Mario sells insurance. His goal is to sell 3 types of insurance to each family on a block. He also wants to sell more than 27 po
    6·1 answer
  • If 2(y-4)=16, then y=
    6·1 answer
  • What is 73 division 84,649
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!