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texaslady36
13.02.2020 •
Social Studies
A homeowner estimates that it will take him 9 days to roof his house. A professional roofer estimates that he could roof the house in 3 days. How long will it take if the homeowner helps the roofer?
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Ответ:
The time it will take to roof the house if the homeowner helps the roofer is 2.25 days.
Explanation:
The time it takes the homeowner to roof his house is, X = 9 days.
The time it takes the professional roofer to roof the house is, Y = 3 days.
Then if the the homeowner helps the roofer, the time it will take to roof the house is, X + Y.
The work done by the homeowner in 1 day is,
.
The work done by the professional roofer in 1 day is,![\frac{1}{Y}=\frac{1}{3}](/tpl/images/0509/7743/76ffc.png)
The work done in 1 day if both the homeowner and the professional roofer work together is,
⇒![Work\ done\ in\ day=(\frac{1}{X}+\frac{1}{Y})=(\frac{1}{9}+\frac{1}{3})=\frac{1+3}{9}=\frac{4}{9}](/tpl/images/0509/7743/8a9f9.png)
Then the number of days it takes to roof the house if both the homeowner and the professional roofer work together, i.e. X + Y is,
⇒![(X+Y)=\frac{1}{Work\ done\ in\ 1\ day}=\frac{1}{(\frac{4}{9}) } =\frac{9}{4} =2.25\ days](/tpl/images/0509/7743/f4d8c.png)
Thus, the time it will take to roof the house if the homeowner helps the roofer is 2.25 days.
Ответ:
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Explanation:
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