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19 May 2019, 21:43
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
83% (01:56) correct
17%
(02:36)
wrong
based on 110
sessions
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Not Attempted Yet
Last year, a coffee roasting company purchased new roasting machines to bring their total number of machines to 10. These 10 machines can roast 210 lbs of coffee beans in 3 hours. Before purchasing the new machines, the company could roast 84 lbs of beans in 2 hours. If all of the machines work at the same constant rate, how many machines did the company buy last year?
A. 1
B. 2
C. 3
D. 4
E. 5
A. 1
B. 2
C. 3
D. 4
E. 5
Rakesh1987
Current Student
Joined: 17 Jul 2018
Last visit: 28 Apr 2026
Posts: 66
Given Kudos: 100
Location: India
Concentration: Finance, Leadership
Schools: Stern '23 (M$)
GMAT 1: 760 Q50 V44
GPA: 4
Updated on: 20 May 2019, 02:45
Originally posted by Rakesh1987 on 19 May 2019, 22:38.
Last edited by Rakesh1987 on 20 May 2019, 02:45, edited 2 times in total.
Last edited by Rakesh1987 on 20 May 2019, 02:45, edited 2 times in total.
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Bunuel
Roasting capacity of each machine in pounds/ hour= \(\frac{210}{10*3} = 7\)
Before buying machines, company could roast 42 lbs (\(\frac{84}{2}\)) each hour, therefore it had \(\frac{42}{7} = 6\) machines.
New machines bought= 10- 6 =4. Answer is D.
Please hit +1 Kudos if you liked the explanation.
Archit3110
Major Poster
20 May 2019, 02:27
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Bunuel
rate per machine ; 210/3*10 ; 7lbs per hour
so in 2 hrs ; 14 lbs per hr
84lbs can be made by 84/14; 6 machines
new machines purchased; 10-6 ; 4
IMO D
