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emmaraeschool
02.03.2020 •
Mathematics
Marilyn and Gene are painting a room. Marilyn can paint it in 1 hour less time than Gene. Together they can do the job in 4 hours. How long will it take Gene if he works alone? Give your answer to the nearest tenth
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Ответ:
Gene can take 0.8 hours to complete work
Step-by-step explanation:
Gene can paint a room in x hours
We are given that Marilyn can paint it in 1 hour less time than Gene
Marilyn can paint a room in (x-1) hours
Gene 1 hour work =![\frac{1}{x}](/tpl/images/0530/1490/3230f.png)
Marilyn 1 hour work =![\frac{1}{x-1}](/tpl/images/0530/1490/84e4e.png)
(Gene and Marilyn)'s 1 day work together=![\frac{1}{x}+\frac{1}{x-1}](/tpl/images/0530/1490/39d26.png)
Together they can do the job in 4 hours.
So, their 1 hour work =![\frac{1}{4}](/tpl/images/0530/1490/0d86b.png)
So,![\frac{1}{x}+\frac{1}{x-1}=\frac{1}{4}](/tpl/images/0530/1490/4e1d3.png)
General equation :![ax^2+bx+c=0](/tpl/images/0530/1490/2bf73.png)
Formula :![x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}](/tpl/images/0530/1490/77630.png)
x=0.812,0.0446
So, Gene can take 0.8 hours to complete work
Ответ: