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Updated on: 23 Dec 2022, 00:53
Originally posted by gmatophobia on 23 Dec 2022, 00:44.
Last edited by gmatophobia on 23 Dec 2022, 00:53, edited 2 times in total.
Last edited by gmatophobia on 23 Dec 2022, 00:53, edited 2 times in total.
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DS Question 1 - Dec 23
Each type A machine fills 400 cans per minute, each Type B machine fills 600 cans per minute, and each Type C machine installs 2,400 lids per minute. A lid is installed on each can that is filled and on no can that is not filled. For a particular minute, what is the total number of machines working?
(1) A total of 4,800 cans are filled that minute
(2) For that minute, there are 2 Type B machines working for every Type C machine working
Source: Official Guide | Difficulty: Medium
23 Dec 2022, 01:06
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PS Question 1 - Dec 23
Alex and Brenda both stand at point X. Alex begins to walk away from Brenda in a straight line at a rate of 4 miles per hour. One hour later, Brenda begins to ride a bicycle in a straight line in the opposite direction at a rate of R miles per hour. If R > 8, which of the following represents the amount of time, in terms of R, that Alex will have been walking when Brenda has covered twice as much distance as Alex?
A. R-4
B. R/(R+4)
C. R/(R-8)
D. 8/(R-8)
E. 2R - 4
Source: ManhattanPrep | Difficulty: Hard
Alex and Brenda both stand at point X. Alex begins to walk away from Brenda in a straight line at a rate of 4 miles per hour. One hour later, Brenda begins to ride a bicycle in a straight line in the opposite direction at a rate of R miles per hour. If R > 8, which of the following represents the amount of time, in terms of R, that Alex will have been walking when Brenda has covered twice as much distance as Alex?
A. R-4
B. R/(R+4)
C. R/(R-8)
D. 8/(R-8)
E. 2R - 4
Source: ManhattanPrep | Difficulty: Hard
23 Dec 2022, 01:59
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1) There must be 2 C machines. However, we cannot determine the exact amount - there could be 4 B machines, or 6A machines, or some combination. Therefore INS.
2) Gives us a ratio, but no further info. INS.
3) From 1 we know that there are 2 C machines. That means we need 4 B machines. 4 B machines gives us exactly 4800 cans/min, therefore there must be 2 C machines and 4 B machines.
