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
Salsk061 [2.6K]
3 years ago
14

The time is takes to build a skyscraper is proportional to its height and inversely proportional to the number of construction w

orkers. If it takes 10 workers 2.5 years to build a 20 story building, how long will it take 80 workers to build a 60 story building?
Mathematics
1 answer:
EastWind [94]3 years ago
8 0

Answer: about 1 year

Step-by-step explanation:

Given : The time is takes to build a skyscraper is proportional to its height and inversely proportional to the number of construction workers.

Let T be the time and N be the number of works and H be the height.

Then, \dfrac{T_1 N_1}{H_1}=\dfrac{T_2N_2}{H_2}

Substitute the values , N_1=10,\ T_1=2.5,\ H_1=20 and N_2=80,\ H_2=60 , we get

\dfrac{2.5\times10}{20}=\dfrac{T_2\times80}{60}\\\\\Rightarrow\ T_2=\dfrac{2.5\times10\times60 }{20\times80}=0.9375\approx1 \ year

Hence, it will take about 1 year for 80 workers to build a 60 story building .

You might be interested in
Geometry question help
CaHeK987 [17]
Reflection over x-axis

hope that helps
6 0
3 years ago
Please help me <br>why - 9/5-1=-14/5​
Jobisdone [24]

Answer:

Step-by-step explanation:

Because you have to take the L.C.M ,

-9/5 - 1

=( -9-5)/5

= -14/5

please  

Brain-list it or support me at my U-Tube channel " ZK SOFT&GAMING " I will be thankful

6 0
3 years ago
Read 2 more answers
Read the following poem:
pentagon [3]

Answer:

7, I believe. I have to fill in the extra character space, so I hope you have a nice day :)

6 0
3 years ago
How do you make a function
dmitriy555 [2]
This site will tell you how https://sciencing.com/write-functions-math-8315770.html
I’m not very good at explaining it sorry
7 0
3 years ago
A nursery sells plants in flats. There are 6 plants in each tray. Each flat has six trays. The nursery sold 18 flats on Saturday
marshall27 [118]

For this case we have to:

There are 6 plants per tray.

There are 6 trays for each flat, so for each flat there are 6 * 6 = 36 plants.

Saturday day:18 flat * 36 plants = 648

Thus, on Saturday they sold 648 plants.

Sunday: 21 flat * 36plants = 756

Thus, on Saturday they sold 756 plants.

Thus, in total 648 +756 = 1404plants were sold.

Answer:

648 +756 = 1404 plants were sold.

3 0
3 years ago
Other questions:
  • Which equation represents a proportional relationship that has a constant of proportionality equal to 4/5
    10·1 answer
  • Kenny's charges $8 per hour to babysit he wants to figure out how much money do you earn in a week which variable is needed to c
    5·1 answer
  • Can I have some help with some math does anyone know some math they could help me with ​
    11·2 answers
  • Mitchell left Detroit on the interstate driving south towards Orlando at a speed of 60 miles per hour. Clark left Detroit 1 hour
    15·1 answer
  • The bus fare in a city is $1.75. People who use the bus had the option of purchasing a monthly coupon book for $21 . With the co
    12·1 answer
  • 3. Of the 32 students in Maria's class, 14 play sports, 19 are in the band, and 6 are involved in both sports and
    7·1 answer
  • Please help someone?!!
    12·1 answer
  • Consider the right triangle. What is the value of x
    9·2 answers
  • Should Santa put Santa's hands in water that's 80° Celsius? What is the Fahrenheit equivalent?​
    15·1 answer
  • Ariana started a savings account with $240. She deposits $30 into her account at the end of each month. She wants to know how ma
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!