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Gray Glaze requires 15 hours to put a new roof on a house. His apprentice, Anna Gandy, can record the house by herself in 20 ho...Asked by Carrie
Gary Glaze requires 25 hours to put a new roof on a house. His apprentice, Anna Gandy, can reroof the house by herself in 32 hours. After working alone on a roof for 20 hours, Gary leaves for another job. Anna takes over and completes the job. How long does it take Anna to complete the job?
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Answered by
X
Gray's rate = 1/25
Anna' rate = 1/32
Job done by Gray = 20(1/25) = 4/5
leaving 1/5 of the job left to be done by Anna
time for Anna to complete
= (1/5) / (1/32)
= 6.4
It will take her 6.4 days to finish the roof.
Anna' rate = 1/32
Job done by Gray = 20(1/25) = 4/5
leaving 1/5 of the job left to be done by Anna
time for Anna to complete
= (1/5) / (1/32)
= 6.4
It will take her 6.4 days to finish the roof.
Answered by
henry2,
Gary completes 20/25 or 4/5 of the roof.
5/5-4/5 = 1/5 = 0.2 of roof remains.
1/32 = 0.2/T.
T = 6.4 Hours.
5/5-4/5 = 1/5 = 0.2 of roof remains.
1/32 = 0.2/T.
T = 6.4 Hours.
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