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
nataly862011 [7]
3 years ago
7

HELP!!!

Mathematics
1 answer:
scoundrel [369]3 years ago
3 0

Answer:

<em>The metalworker should use 60 kg of metal alloy that is 70% copper and 40 kg of metal alloy that is 20% copper.</em>

Step-by-step explanation:

<u>System of Equations </u>

Let's call  

x=amount of metal alloy that is 20% copper

y=amount of metal alloy that is 70% copper

The metalworker wants to create 100 Kg of 50% copper alloy. This gives us the first relation

x+y=100

The combination of 20% of x and 70% of y will produce 50% of the sum of both, thus

20x+70y=50(x+y)

Operating

20x+70y=50x+50y

Reducing and dividing by 10

2y=3x

The system of equations is easily solved by isolating x in the first equation

x=100-y

And replacing into the last equation

2y=3(100-y)

Operating

2y=300-3y

5y=300

y=60

Thus

x=100-60=40

The metalworker should use 60 kg of metal alloy that is 70% copper and 40 kg of metal alloy that is 20% copper.

You might be interested in
1/8y as an algebraic expression
rewona [7]
Y/8 simplified maybe
8 0
3 years ago
Brain Teaser! Will be posting till I run out! Winner gets a brainliest!
adoni [48]

Answer:

i tried

Step-by-step explanation:

im suppose to be gifted... it took me 20 minutes and im in 9th grade RIP, but is it 9??

7 0
3 years ago
What is the domain of 6x+7/9x+2
Anon25 [30]

Answer:

Domain of the function is (inf, -inf)

Step-by-step explanation:

6 0
3 years ago
How much money should be invested in an account that earns 3% interest, compounded monthly, n=12, in order to have $14,000 in 4
melisa1 [442]

Answer:

D ko alam HAHAHAHA bahala kang bobo ka HAHAHAHAHAHAHA

Step-by-step explanation:

Tanong mo kay ser kung anong sagot potanginamo ka

5 0
2 years ago
Please help I need it today please help
Rufina [12.5K]
0-2+9=7 is the answer I think
6 0
3 years ago
Other questions:
  • 24. Janelle has 342 pennies, 62 nickels,
    9·2 answers
  • Your business sells cupcakes in boxes of 10. The demand equation is
    11·2 answers
  • Someone help me with problem 2 I do not understand. Help please and thank you
    12·1 answer
  • What is the value of the function when x = 6?
    8·1 answer
  • PLEASE HELP. !!!!!!!!!!
    5·2 answers
  • Graphing please help I have to submit in 30minutes
    12·1 answer
  • Corresponding angles and interior angles can never have equal angle
    13·1 answer
  • Please help me do i will really appreciate it
    5·2 answers
  • jane and her friends meet for pizza once a week. they always leave the waiter a tip that is a percent of the total bill. this we
    9·1 answer
  • Directions: Solve the following by multiplying by the inverse of the fractional coefficient. 1. \frac{2}{5} t = 20 2. \frac{7}{8
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!