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Schach [20]
3 years ago
10

Solve the following work problem.

Mathematics
2 answers:
evablogger [386]3 years ago
6 0
Determine the rates for all 3.

First pipe has a rate of 1/36 full per minute
Second pipe has a rate of 1/9 full per minute
Third pipe has a rate of 1/12 full per minute

So if all 3 were operating together, they would have a rate of:

1/36 + 1/9 + 1/12 = 1/36 + 4/36 + 3/36 = 8/36 = 2/9

So the rate for all 3 is: 2/9 full per minute.

So to fill up a tank:

full tank * 1min ÷ (2/9 full) = 4.5 minutes

So it would take 4 and half minutes.
RoseWind [281]3 years ago
6 0
The power of
The 1st pipe - 1/36
The 2nd pipe - 1/9
The 3rd pipe - 1/12

1/36+1/9+1/12=1/36+4/36+3/36=8/36

36/8=4.5

The answer is 4.5 minutes.
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A shipping company selects 75 random packages to check their weight. It finds 3 packages were weighed incorrectly. How many pack
Sunny_sXe [5.5K]
So Basically if you divide 3 by 75 you will get 0.04(which is equivalent to 4%). 4% of 3000=120 which is your answer
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3 years ago
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Jana and her friend bought 4 hamburgers, 3 orders of fries, and 2 milk shakes for $3 each. They paid for the food with $20. Whic
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(4h+3f+6). 4h represents the 4 hamburgers, 3d represents the 3 fries, and the 6 is the 2 milkshakes at 3 dollars each.
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PLEASE HELP I WILL MARK BRAINLIEST!!!! :)
tia_tia [17]
Answer: B

Explanation:
(75 + 90)/250 = 0.66 = 66% of students are 11 or 12
5/250 = 0.02 = 2% of students are 10
(90 + 70)/250 = 0.64 = 64% of students are 12 or 13
10/250 = 0.04 = 4% of students are 14
7 0
3 years ago
An ice sculpture in the form of a sphere melts in such a way that it maintains its spherical shape. The volume of the sphere is
olga nikolaevna [1]
The volume of the sphere is:
 V = 4 / 3πr ^ 3
 Deriving we have:
 V '= (3) (4/3) (π) (r ^ 2) (r')
 From here, we clear the value of r ':
 r '= (V') / ((4) (π) (r ^ 2))
 Substituting values:
 r '= (2π) / ((4) (π) ((5) ^ 2))
 r '= (2π) / ((4) (π) (25))
 r '= (2π) / (100π)
 r '= 1/50
 Then, the surface area of the sphere is:
 A = 4πr ^ 2
 Deriving we have:
 A '= 8πrr'
 Substituting values:
 A '= 8π (5) (1/50) 
 Rewriting:
 A '= (40/50) π
 A '= (8/10) π
 A '= (4/5) π
 Answer:
 
The surface area of the sphere is decreasing at:
 
(A) 4pi / 5
8 0
4 years ago
A right rectangular prism has length 3 and one third yd​, width 2 and one third yd​, and height 1 and one third yd. You use cube
Levart [38]

Answer:

Volume of the rectangular prism = 280 cubes

Volume of the rectangular prism = (280/27) yd³

Step-by-step explanation:

length 3 and one third yd​ = 3 + (1/3) yd = (10/3) yd

width 2 and one third yd​ = 2 + (1/3) yd = (7/3) yd

height 1 and one third yd = 1 + (1/3) yd = (4/3) yd

Cubes of edge length (1/3) yd are used to fill the rectangular prism.

The length would contain (10/3) ÷ (1/3) = 10

The width would contain (7/3) ÷ (1/3) = 7

The height would contain (4/3) ÷ (1/3) = 4

Volume of the rectangular prism = 10×7×4 = 280 cubes

Or

Volume of rectangular prism = (10/3)(7/3)(4/3) = (280/27) yd³

5 0
3 years ago
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