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
Irina-Kira [14]
3 years ago
6

A scientist needs 60 liters of a 40% solution of alcohol. He has a 30% solution and a 60% solution available. How many liters of

the 30% solution and how many liters of the 60% solution should he mix to make the 40% solution?
Mathematics
1 answer:
Monica [59]3 years ago
6 0

A scientist needs 60 liters of a 60% acid solution. He currently has a 40% solution and a 70% solution. How many liters of each does he need to make the needed 60 liters of 60% acid solution?

----------------

Equation:

acid + acid = acid

----------------------

0.40x + 0.70(60-x) = 0.60*60

-----

40x + 70*60 - 70x = 60*60

 

-----

-30x = -10*60

x = 20 liters

----

Gabe needs 20 liters of the 40% solution.

He also needs 40 liters of the 70% solution.

You might be interested in
What's the distance between 178 and -395
Svet_ta [14]
178 - (-395)

178 + 395 = 573

the distance between -395 and 178 is 573

hope this helps
4 0
3 years ago
Find the measure of and angle between o degrees and 360 degrees coterminal with an angle of 399 degrees in standard position
horrorfan [7]

Answer:

39 degrees.

Step-by-step explanation:

We want an angle  x  such that   0 < x < 360   and angle x is coterminal with an angle of measure 399 degrees.

so   x =  399 - 360 = 39 degrees

5 0
3 years ago
Tom,Scott and dawn sold cookies at the school fair.
aleksklad [387]
First of all work out how many tom and scott sold.
tom sold 60% of 90 cookies which is 54.
scott sold 2/3 of 150 cookies which is 100.
altogether the three of them sold 54+100+46 cookies which is 200.
Dawn sold 46 of these 200 cookies. To work out the percentage we have both the numbers to get 23 out of 100. We halved those numbers because a percentage is out of 100 we halved it to get it out of 100.
so 23 out of 100 is 23% so dawn sold 23%of the cookies.

Hope this helps :)
3 0
3 years ago
When you subtract one negative integer from another will your answer be greater than or less than the integer you started with
MatroZZZ [7]

Subtracting a negative integer is the same as adding a positive integer. Adding a positive integer to any number always makes the answer larger than the original number. Therefore, if you subtract one negative integer from another your answer will be always be *greater* than the integer you started with.

5 0
3 years ago
Write a relate substraction fact 6+8=14
ad-work [718]
21-7=14 is a relate subtraction problem
7 0
3 years ago
Read 2 more answers
Other questions:
  • Find the mean for the set of number? please help me with the problem<br> 10.7,10.8,4.511.2
    7·2 answers
  • Write the equation 2y - 4x = 5 in the form y = mx + b
    10·2 answers
  • At the school book fair, Henry brings $10.00. He purchases a book for 8.50, plus a 6% sales tax. How much money in change will H
    5·2 answers
  • Plz help answer <br> y=2x-3 x+y=18
    11·1 answer
  • Misha’s group was asked to write an expression equivalent to 7y2z+3yz2-3 . When Mr. Chen checked their answers, he found only on
    13·1 answer
  • Helpppp please!!!!!!
    6·2 answers
  • A box of dried fruit has 51 calories in 3 servings. how many calories are in 1 serving?
    13·1 answer
  • PLEASE HELP ILL MARK BRAINIEST
    8·1 answer
  • Please help: <br> First photo is the graph, second is the questions.
    15·2 answers
  • When Jennifer purchases her house, she pays a 3% realtor commission for the $1800,000 loan amount. How much commission did Jenni
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!