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 #2 (permalink) Mon May 04, 2009 13:42 pm Sentence: Andy and Alex can do an assignment in 20 and 25 days alone,... |
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| Uis wrote: |
Can anyone please help with this?
Andy and Alex can do an assignment in 20 and 25 days alone, respectively. If Andy started working and Alex joins him after 5days how much longer will it take to complete the assignment working together? |
i guess 25/3 is right answer . If its correct reply will give you the solution |
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Knrnjn
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| #3 (permalink) Mon May 04, 2009 20:18 pm Sentence: Andy and Alex can do an assignment in 20 and 25 days alone,... |
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16 days & 21hrs.
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 Kitosdad
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| #4 (permalink) Tue May 05, 2009 1:23 am Sentence: Andy and Alex can do an assignment in 20 and 25 days alone,... |
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I found the method.
Rate of Andy = 1/20
Rate of Alex = 1/25
Andy work for 5 days;
The amount of work Andy finished = (1/20) x 5 = 1/4
The amount of work remain = 1- 1/4 =3/4
# of days taken by both = N
working rate of both = (3/4)/N
1/20 + 1/25 = (3/4)N
N = 25/3 days |
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Uis
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Joined: 16 Apr 2009
Posts: 3
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| #5 (permalink) Tue May 05, 2009 10:39 am Sentence: Andy and Alex can do an assignment in 20 and 25 days alone,... |
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My solution was derived from Andy having already completed one quarter of the work.
Therefore he had 15 days work yet to do. (3/4)
Alex now only had 18.75 days work to do.
Total time to work = 33.75 days / 2
=16.875 days = 16 days 21 hours.
What is the correct answer ?
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Kitosdad
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| #6 (permalink) Tue May 05, 2009 17:17 pm Sentence: Andy and Alex can do an assignment in 20 and 25 days alone,... |
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| Kitosdad wrote: |
My solution was derived from Andy having already completed one quarter of the work.
Therefore he had 15 days work yet to do. (3/4)
Alex now only had 18.75 days work to do.
Total time to work = 33.75 days / 2
=16.875 days = 16 days 21 hours.
What is the correct answer ? |
you got wrong on "Andy had 15 days work yet to do". We can not predict the days like this as both are going to work.
The OA is 25/3 days. |
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Uis
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Joined: 16 Apr 2009
Posts: 3
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| #7 (permalink) Fri May 08, 2009 6:06 am Sentence: Andy and Alex can do an assignment in 20 and 25 days alone,... |
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Good morning Uis. I simply asked if you knew the answer.
You chose to use the same logic as I, but expressed yours in a mathematical equation.
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Kitosdad
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