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A carpenter makes 3 bunk beds every day. A military school needs to or

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Bunuel
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A carpenter makes 3 bunk beds every day. A military school needs to or [#permalink] New post  14 Jul 2016, 01:52
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A carpenter makes 3 bunk beds every day. A military school needs to organize a place to sleep for 143 soldiers. If there are 5 carpenters working on the job, how many whole days in advance should they receive the order and start working in order to finish the right number of beds assuming that each bunk- bed is used by two soldiers?

A. 3.
B. 4.
C. 5.
D. 6.
E. 7.
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Re: A carpenter makes 3 bunk beds every day. A military school needs to or [#permalink] New post  14 Jul 2016, 01:58
Bunuel wrote:
A carpenter makes 3 bunk beds every day. A military school needs to organize a place to sleep for 143 soldiers. If there are 5 carpenters working on the job, how many whole days in advance should they receive the order and start working in order to finish the right number of beds assuming that each bunk- bed is used by two soldiers?

A. 3.
B. 4.
C. 5.
D. 6.
E. 7.


IMO : C

1c = 3 beds

5c = 15 bed

no' of beds required = 142/2 +1 = 72

no' of days in advance = 72/5 = 5 (whole days)
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Re: A carpenter makes 3 bunk beds every day. A military school needs to or [#permalink] New post  14 Jul 2016, 06:00
Bunuel wrote:
A carpenter makes 3 bunk beds every day. A military school needs to organize a place to sleep for 143 soldiers. If there are 5 carpenters working on the job, how many whole days in advance should they receive the order and start working in order to finish the right number of beds assuming that each bunk- bed is used by two soldiers?

A. 3.
B. 4.
C. 5.
D. 6.
E. 7.


If two soldiers sleep on one bunk bed, school needs 143/2= 72 bunk beds.

1 carpenter can make 3 beds and 5 carpenters can make 15 beds/day.

15 beds will be ready in 1 day, so to have 72 beds ready, carpenters require 72/15 = 5 (closest integer) days


C is the answer
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Re: A carpenter makes 3 bunk beds every day. A military school needs to or [#permalink] New post  14 Jul 2016, 08:33
Bunuel wrote:
A carpenter makes 3 bunk beds every day. A military school needs to organize a place to sleep for 143 soldiers. If there are 5 carpenters working on the job, how many whole days in advance should they receive the order and start working in order to finish the right number of beds assuming that each bunk- bed is used by two soldiers?

A. 3.
B. 4.
C. 5.
D. 6.
E. 7.



I believe it is C because if 1C makes 3 beds in 1 day then:

1C's rate = 3/1

So 5c's = 3/1 * 5 = 15/1 = 15 beds in a day.

Since we have 173 soldiers who need beds and bunk beds come in pairs, 72 is the least amount of beds needed.

Time = Amount / Rate

Time = 72 / (15/1) = 72/15, simplifying we get 72/15 = 24/5 = 4.8

So, in order for the carpenters to be able to finish they need 5 whole days. At first I made the mistake of thinking how many whole days it took them to finish (as in ignore the partial day) but the prompt clarifies "days in advance", meaning how many days would they need to finish so even if they finish early, they "used" that day.
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Re: A carpenter makes 3 bunk beds every day. A military school needs to or [#permalink] New post  31 Dec 2021, 02:18
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Re: A carpenter makes 3 bunk beds every day. A military school needs to or [#permalink]
31 Dec 2021, 02:18
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