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
densk [106]
3 years ago
14

Elam can wire a light in 40

Mathematics
2 answers:
NeX [460]3 years ago
6 0

Answer:

24 minutes

Step-by-step explanation:

We use 1/a + 1/b = 1/c

where a and b are the individual times and c is the time together

1/40 + 1/60 = 1/c

Multiply each side by 120c

120c( 1/40 + 1/60 = 1/c)

3c + 2c = 120

5c = 120

Divide each side by 5

5c/5 = 120/5

c = 24

zvonat [6]3 years ago
5 0

Answer: 24 minutes

Step-by-step explanation: To solve this kind of a problem which is called a work problem, it's important to understand the following idea.

Since Elam can wire a light in 40 minutes, we know that in 1 minute,

Elam can wire 1/40 of the light and in 2 minutes, Elam can wire 2/40 of it.

Therefore, in <em>t</em> hours, Elam can wire t/40 of the light.

The same applies for Michael, in <em>t</em> hours, he can wire t/60 of the light.

So to solve the problem, we use the following formula:

Part of job done by Elam + part of job done Michael = 1 job done

The part of the job done by Elam is t/40 and t/60 for Michael.

So we have t/40 + t/60 = 1.

Now multiply both sides by 120 to get 3t + 2t = 120

or 5t = 120 so t = 24.

So it takes 24 minutes if they work together.

You might be interested in
182 is what percent of 130?​
Gnom [1K]

Answer:

140%

Step-by-step explanation:

6 0
2 years ago
Make an estimate. Write a number sentence for you estimate 927 divided by 8
notka56 [123]

Answer:

estimated answer: 115

Step-by-step explanation:

By number sentence im guessing a word problem so if i'm wrong I apologize.

Johnny had 927 pokemon cards he wanted to get rid of so he shared them equally amongst 8 friends. If each friend received the same amount of cards than each friend shall receive about 115 cards

5 0
3 years ago
Which side lengths form a right triangle?
vampirchik [111]

Answer:

A and C

Step-by-step explanation:

<h3>A</h3>

=  \sqrt{ {5}^{2} + ( \sqrt{6})^{2}  }  \\  =  \sqrt{25 + 6}  \\  =  \sqrt{31}

<h3>C</h3>

=  \sqrt{ {9}^{2} +  {12}^{2}  }  \\  =  \sqrt{81 + 144}  \\  =  \sqrt{225}  \\  = 15

5 0
2 years ago
Read 2 more answers
Whats the value c<br> Pleaseee help
nikklg [1K]

Step-by-step explanation:

the value of x is 20 that's it good luck

8 0
2 years ago
Read 2 more answers
Use the drawing tool(s) to form the correct answer on the provided number line.
Nat2105 [25]

Answer:

j=42.36

Step-by-step explanation:

=15 to original answer

7 0
3 years ago
Other questions:
  • Skyler buys a bag of cookies that contains 9 chocolate chip cookies, 5 peanut butter cookies, 9 sugar cookies and 7 oatmeal rais
    9·1 answer
  • How do you solve for x in x^2+5x=36
    6·2 answers
  • Enter the coordinates of the vertex of the graph of y=2(x+5)^2
    13·2 answers
  • Evaluate: 2^-2 x (13x3)-5^3
    11·2 answers
  • PLEASEE I NEED HELP ASAPPP i gon get in trouble if i dont answer this 15 pts btw.
    8·1 answer
  • Which number is not rounded correctly? A. 1.254 rounded to 1.25 B. 20.7 rounded to 21 C. 0.632 rounded to 0.63 D. 13.76 rounded
    11·2 answers
  • Any trans people on this app that have discord?​
    8·1 answer
  • What is the value of the expression below when z = 5
    12·1 answer
  • Please help me please help me please help me
    8·1 answer
  • The rhinoceros iguana, which lives on the island of Hispaniola, lays up to 20 eggs in a burrow. While studying an iguana colony,
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!