0
A can do a piece of work in 14 days and B in 21 days They begin the work together but 3 days before the completion of work A leaves The work was completed in?
Wiki User
∙ 14y ago
'A' does (1/14) of the job in 1 day. 'B' does (1/21) of the job in 1 day.
'B' worked alone for the last 3 days. In that time, he did the last (3/21) of the job.
So the part they did together was the first (18/21) of the total job.
Working together, they do (1/14 + 1/21) = (3/42 + 2/42) = (5/42) of the job each day.
If the number of days they worked together was 'D', then (5/42)D = (18/21).
D = (18/21) / (5/42) = (18/21) x (42/5) = (18 x 42 / 21 x 5) = 36/5 = 7.2 days.
They worked together for 7.2 days. Then 'A' left. and 'B' worked alone for 3 days.
The work was completed in (7.2 + 3) = 10.2 days.
=========================================
Check:
[ (7.2) x (5/42) ] + (3/21) = (36/42) + (3/21) = (36/42) + (6/42) = (42/42) = 1 job yay!
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What means ''Conclusion''?
in the English language when a litereture or and essay is almost completed the writed usually leaves the last couple paragraphs to summaries the entire script or give his final taughts or expression on the suject matter,this is referred to as conclusion
Why did the panda eat dinner at the shanghai diner then fire a basketball into the trash can before walking out?
A panda eat shoots and leaves
If ann can sweep the leaves from a yard in 6 minutes and grace can do it in 8 minutes how much can they get done working together for 3 minutes?
They can complete 87.5 % of the yard.
What is the shape of the mimosa's leaves?
compound leaves
What number divided by 3 leaves 2 by 5 leaves 2 and by 7 leaves 5?
no number does that
How can you say if your husband cheating you if he is working abroad?
Give Him a harmonica before he leaves. When he gets back, before you do anything with him together, have him play you a few songs.
How do you get rid of the adult tamagotchi after its had its baby v2?
The adult Tama leaves its child after a full 24hours, and then leaves the midnight after the 2hour period is completed.
Processing Emergency Leaves can be completed during the Sustainment Phase of deployment?
All of the Above
Your boyfriend and you dated before for three months and you got back together for almost a month now hes going away to India soon should you kiss him before he leaves or not at all?
Yes.
Why do you not eat the leaves of rhubarb?
Allow the plant to establish for one year before taking the first harvest. Select three of the largest stalks, wait for the leaves to open before pulling from May to August
In the book lord of the flies what does Jack do before he leaves the assembly?
Before jack leaves the assembly jack places the conch carefully on the log.
Is a ring with leaves or flowers twisted together called?
wreath
Where are Owen falls?
The Owen Falls was a waterfall on the White Nile in Uganda near the city of Jinja, 4 km from the point at which the river leaves Lake Victoria. The falls, together with the nearby Ripon Falls were submerged in 1954 with the completion of the Owen Falls Dam that now accommodates a hydroelectric power station.
The coding nucleotides that splice together before the mRNA leaves the nucleus?
Genes! I didn't know the answer either, but this question was a clue in my homework crossword puzzle so I guessed and it fit!! Yay!
What are the release dates for Before the Last Leaves Fall - 1913?
Before the Last Leaves Fall - 1913 was released on: USA: 30 December 1913
Group of leaves called?
A group of leaves is called a pile. A pile of leaves is collected together during the autumn season when they fall from the trees.
What kind of clause would 'before Jane leaves' be?
The clause "before Jane leaves" is a dependent clause, which means it relies on an independent clause, or main clause, to complete the sentence's meaning.Answer:'Before Jane leaves home,..' on its own is a dependent clause, or what is also known as a hanging clause waiting for the main clause to make it complete.'Before Jane leaves home' is also an introductory adverbial clause as it has a subject 'I' and a verb 'leaves' which make it a clause, then it has the prepositional word 'before' telling when Janes leaves home. This; therefore, introduces the adverbial clause.Before Jane leaves home, she clears the table.'She clears the table.' ( main clause that can stand on its own as a dependant sentence)'Before she leaves home,...' is dependent on 'she clears the table.' to make it complete.
