Answer: 4.5 feet
Explanation: If there is 81 feet of ribbon and 18 students then to solve this equation your going to have to divide. If you divide 81 by 18 you will get 4.5 feet. Thank you for your time.
Answer: 16 1/4 minutes
Step-by-step explanation:
Let A be the mowing rate for the first person, and B the rate for the second. X will be the time spent mowing.
We are told that A = 30 min/lawn. B = 45 min/lawn. These are conversion factors, so we can invert them to:
A = 1 lawn/30 min. B = 1 lawn/45 min
If both work together, the amount of lawn that is mowed working togehterwould be the time, X (in minutes), spent times their individual rates:
X*(A + B) = Lawn Mowed
We want to know the time, X, it would take to mow the same 1 lawn together. [Lawn Mowed = 1]. Use the equation:
X*(A + B) = Lawn Mowed
X*((1 lawn/30 min) + (1 lawn/45 min)) = 1
X/(30 min) + X/(45 min) = 1
X/30 + X/45= 1
X + X(30/35) = 30 {Multiply both sides by 30]
(1 + 30/35)X = 30
(65/35)X = 30
X = 30*(35/65)
X = 30/(7/13)
X = 30*(7/13)
X = 210/13
X = 16 1/4 minutes
Answer:
Multiply each side by -5/4 to isolate x
x = -100
Step-by-step explanation:
-4/5x = 80
Multiply each side by -5/4 to isolate x
-5/4 * -4/5x = -5/4 * 80
x = -100
The things you can apply to complete this job is workers and time. The job being accomplished is painted walls.
This problem defines two jobs. The rate for each of the jobs will be the same. The first job rate is:
R=(7 wkr)•(42 min)/(6 walls)
R= 49 wkr-min/walls
or 49 worker-minutes per wall. This means one worker can paint one wall in 49 minutes.
If you think about this job if 7 workers take 42 minutes to do 6 walls it will only take them 7 minutes to do one wall. And it will take one person 7 times as long to do a job as 7 people working together.
This first job rate equals the second job rate
R=(8 wkr)•(t )/(8 walls)
R=1 t wkr/wall
where t is the time to do the second job.
Setting the two rates equal to each other and solving for t.
t=49 minutes
It makes sense if one worker can paint one wall in 49 minutes then 8 workers can paint 8 walls in the same time.