<span>x(x2 5) – 9(x2 5)
Hope this helps! (:
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-5.87 then -33 then 0.6 then 17
28 men are needed to paint the room in 3 hours
<h3><u>Solution:</u></h3>
Given that it takes 12 hours for 7 men to paint a room
We are asked to find number of men required to paint the room in 3 hours
Recognize, "paint the room" is 1 task. One job.
7 men -------- 12 hours ------ 1 job
(7/7) = 1 men ------- 12 x 7 (84) ------- same 1 job
The one men is rate is 84 hours to do the job
We can express this as 1/84 jobs per hour, the one-person rate
Now lets find how many men needed to paint the room in 3 hours
Let the required number of men for 3 hours be "a"
The rates of each person is simply additive.
![a \times \frac{1}{84} \times 3 = 1](https://tex.z-dn.net/?f=a%20%5Ctimes%20%5Cfrac%7B1%7D%7B84%7D%20%5Ctimes%203%20%3D%201)
corresponds to rate x hours = jobs and "a" is a variable for how many men
![a \times \frac{1}{28} = 28](https://tex.z-dn.net/?f=a%20%5Ctimes%20%5Cfrac%7B1%7D%7B28%7D%20%3D%2028)
Thus 28 men are needed to paint the room in 3 hours
If you would like to know the rate at which she was travelling, you can calculate this using the following steps:300 miles ... 4.5 hoursx miles = ? ... 1 hour300 * 1 = 4.5 * x300 = 4.5 * xx = 300 / 4.5x = 200 / 3x = 66.67 miles per hour Janet was travelling at the rate 66.67 miles per hour.
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