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rich28
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Ann does 2/3 of a job in 4 days. How long does it take Kena, 19 Aug 2003, 04:39
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1.Ann does 2/3 of a job in 4 days. How long does it take Kena, who works twice as fast, to finish the job?

A. 1 day
B. 2 days
C. 3 days
D. 4 days
E. 6days


2. how long does it take a group of ten men to do a job if four men fewer take four days more to do it?

A. 4
B 6
C. 8
d. 10
E. 12



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Ann does 2/3 of a job in 4 days. How long does it take Kena, 19 Aug 2003, 05:31
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1) C - 3 days
2) B - 6 days
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rich28
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Ann does 2/3 of a job in 4 days. How long does it take Kena, 19 Aug 2003, 06:47
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Correct, the book had A. as for question 1, but it must be a typo.

Anyone use an easy equation for the second question?

R
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Ann does 2/3 of a job in 4 days. How long does it take Kena, 19 Aug 2003, 08:51
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rich28
Correct, the book had A. as for question 1, but it must be a typo.

Anyone use an easy equation for the second question?

R


Let t be the time taken by 10 men

Let the work required be W

Then W/6-W/10=4 which gives W=60

Substituting in W/10=t we get t=6
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Ann does 2/3 of a job in 4 days. How long does it take Kena, 19 Aug 2003, 14:33
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for question 1, why is A a typo? can someone please help me? What I did was:

the first one does 2/3 in 4 days, which means she does 1/6 in 1 day, right? And the second person works twice as fast, which means she does 1/6*2 in 1 day, which = 1/3.

so if 1/3 of the job is left, it will take the second person 1 day to finish the job. or A.

so why is it C, what did I do wrong?

Thanks!
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Ann does 2/3 of a job in 4 days. How long does it take Kena, 20 Aug 2003, 09:27
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I think we all read the question wrong. The question asks how long will it take the 2nd person to finish the job, not how long does the 2nd person take to do the job.

Thanks

Rich
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Brainless
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Ann does 2/3 of a job in 4 days. How long does it take Kena, 20 Aug 2003, 11:32
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I go with 1) A and 2) B
But 1)'s wording is totally misleading .. Instead it should have been

"Ann completed 2/3 of a job in 4 days. How long does it take Kena, who works twice as fast, to finish the job? "



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