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
MaRussiya [10]
3 years ago
5

An alloy of tin is 15% tin and weights 20 pounds. A second allow is 10% tin. How many pounds of the second alloy must be added t

o the first to get a 12% mixture?
30 lb

40 lb

60 lb
Mathematics
1 answer:
Fofino [41]3 years ago
8 0
Let x represent the amount to be added. The total amount of tin will be
  15%·20 + 10%·x = 12%·(20+x)
  (15%-12%)·20 = (12%-10%)·x
  3%·20/2% = x
  30 = x

30 pounds of 10% tin must be added to get a 12% mixture.
You might be interested in
What is x in 832 = 2( 7.5x + 39)
ziro4ka [17]

Answer:

5 rolls is the answer

6 0
3 years ago
Read 2 more answers
Find the diameter of Oo. A line that appears to be tangent is tangent. If your answer is not a whole
Trava [24]

Answer:

Diameter = 9

Step-by-step explanation:

Let the diameter be represented as x.

Based on the secant-tangent theorem, the following equation representing the relationship between the segments would be:

(16 + x)(16) = 20²

256 + 16x = 400

Subtract 256 from each side

16x = 400 - 256

16x = 144

Divide both sides by 16

x = 144/16

x = 9

Diameter = 9

8 0
3 years ago
Solve for x<br> 4r – 9 – 6x = 21
ehidna [41]

Answer:

X= 30-4r/-6

Step-by-step explanation:

1. Move the 9 to the other side. (21+9=30)

2. subtract the 4r and move it to the other side (-6x=21-4r)

3. divide both sides by -6

5 0
3 years ago
Find the height of the trapezoid.<br> 7 m<br> Area = 51 m2<br> 10 m
andrew11 [14]
The answer is 6

h = 2 A/a+b = 2 51/10+7 = 6
3 0
2 years ago
What is 7/9dividing1/3 a fraction is
Mkey [24]

Answer:

7/9 ÷ 1/3 = 21/9 as simplified as 7/3 in fraction form. 7/9 ÷ 1/3 = 2.3333 in decimal form.

4 0
3 years ago
Other questions:
  • Hat is the percent uncertainty in the measurement 2.00 ± 0.30 m?
    10·1 answer
  • Find the greatest common factor of 10, 7, and 14.
    14·2 answers
  • For safety reasons, four different alarm systems were installed in the vault containing the safety deposit boxes at a Beverly Hi
    13·1 answer
  • Solve the following system of equations. What is the y value of the solution?
    5·2 answers
  • How many solutions does this equation have?<br><br> 8n = 10 + 10n
    12·1 answer
  • Use the substitution method to solve the system of equations. Choose the correct ordered pair. y=6x-4 y=7x-7
    10·1 answer
  • Evaluate 5x + 7 for x = - 2 plz help fastt​
    14·1 answer
  • What is 16 times 4? help
    10·2 answers
  • 71, 80, 82, 78, 80, 91, 107, 121, 125, 131, and 142. The variance of this data set is?
    15·1 answer
  • HELPPP THIS IS TIMEDD I NEED A STEO BY STEPP
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!