Each hour, a wood-harvesting machine cuts the same number of logs and places them on a pile. At 8 am, there are 13 logs on the pile. At 11 am, the pile has grown to 46 logs. How many logs will the pile contain at 6 pm, the same evening?
(A) 108
(B) 112
(C) 117
(D) 123
(E) 135
logs on the pile
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- sanju09
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Last edited by sanju09 on Fri May 14, 2010 12:46 am, edited 1 time in total.
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I am sorry.. I couldn;t quite follow your logic... I was getting answer as 123 which is obviously wrong and so I need to understand how you got 112.dtweah wrote:8AM 9AM 10 AM 11AM ............. 6PM (18hrs)
13 13 +x 13+2x 13+3x =46..............112
13+3x=46
x=11
t10 ( 18hr -8hr=10) = 13+(10-1)11=112
Choose B
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46-13 is 33. 33 logs in 3 hours is 11 logs/hour.sanju09 wrote:Each hour, a wood-harvesting machine cuts the same number of logs and places them on a pile. At 8 am, there are 13 logs on the pile. At 11 am, the pile has grown to 46 logs. How many logs will the pile contain at 6 pm, the same evening?
(A) 108
(B) 112
(C) 117
(D) 126
(E) 135
From 11am until 6pm there are 7 hours. 7 * 11 = 77 new logs.
46 + 77 = 123, which is the correct answer to the question. What's the source?
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Sorry pals for appearing so late on this thread, the OA is [spoiler](D) 123[/spoiler], which is by some typo, 126 there, I will edit it.
regards
regards
The mind is everything. What you think you become. -Lord Buddha
Sanjeev K Saxena
Quantitative Instructor
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Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001
www.manyagroup.com