# Metal sheets

How much metal sheet is needed to produce 8 gutters 4 m long and 12 cm in diameter? During production joints calculate at 3% of total consumption.

Correct result:

A =  6.213 m2

#### Solution:

$D=12 \ cm \rightarrow m=12 / 100 \ m=0.12 \ m \ \\ r=D/2=0.12/2=\dfrac{ 3 }{ 50 }=0.06 \ \text{m} \ \\ l=8 \cdot \ 4=32 \ \text{m} \ \\ \ \\ S_{1}=\pi \cdot \ D \cdot \ l=3.1416 \cdot \ 0.12 \cdot \ 32 \doteq 12.0637 \ \text{m}^2 \ \\ \ \\ q=3 \%=1 + \dfrac{ 3 }{ 100 }=1.03 \ \\ \ \\ A=S_{1} / 2 \cdot \ q=12.0637 / 2 \cdot \ 1.03=6.213 \ \text{m}^2$

Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

Please write to us with your comment on the math problem or ask something. Thank you for helping each other - students, teachers, parents, and problem authors.

Tips to related online calculators
Our percentage calculator will help you quickly calculate various typical tasks with percentages.
Do you want to convert area units?

## Next similar math problems:

• Gutter pipe
How many m² of sheet metal is required to produce a 12 m long and 18 cm wide gutter, if 7% bend is required?
• Pine
How much of a mixed forest rangers want to cut down, if their head said: "We only cut down pine trees, which in our mixed forest 98%. After cut pine trees constitute 94% of all trees left."
• Kitchen
Kitchen roller has a diameter 70 mm and width of 359 mm. How many square millimeters roll on one turn?
• The Chemistry test
The Chemistry test contained 8 questions, each with 3 points. Peter scored 21 points. How many percent did Peter write a test?
• Percents
How many percents is 900 greater than the number 750?
• Art school
Every fifth pupil 9A goes to art school. How many percent of pupils in class 9A go to art school?
• Walking
Of the 450 students at the school, 432 walks to school. What percentage is this?
• Researchers
Researchers ask 200 families whether or not they were the homeowner and how many cars they had. Their response was homeowner: 14 no car or one car, two or more cars 86, not homeowner: 38 no car or one car, two or more cars 62. What percent of the families
• Profit gain
If 5% more is gained by selling an article for Rs. 350 than by selling it for Rs. 340, the cost of the article is:
• Highway repair
The highway repair was planned for 15 days. However, it was reduced by 30%. How many days did the repair of the highway last?
• Percentage increase
Increase number 400 by 3.5%
• Summerjob
The temporary workers planted new trees. Of the total number of 500 seedlings, they managed to plant 426. How many percents did they meet the daily planting limit?
• Persons
Persons surveyed:100 with result: Volleyball=15% Baseball=9% Sepak Takraw=8% Pingpong=8% Basketball=60% Find the average how many like Basketball and Volleyball. Please show your solution.
• Percentages
52 is what percent of 93?
• Alaska vs Montana
Alaska is the largest state in the United States and has a surface area of approximately 588,000 square miles. Montana has a surface area that is approximately 25% of the surface area of Alaska. What is the approximate surface area of Montana?
• Reward
Janko and Peter divided the reward from the brigade so that Peter got 5/8 of the reward. What percentage of Janko's reward got?
• Cylinder - A&V
The cylinder has a volume 1287. The base has a radius 10. What is the area of surface of the cylinder?