gmatophobia wrote:
DS Question 1 - Jan 24 If k is an integer, is 1/2^(1-k) < 1/8 ? (1) k is a prime number (2) k^2 + 1 is a prime number Source:
GMAT Club Tests | Difficulty : Hard
gmatophobia wrote:
DS Question 2 - Jan 24 What is the standard deviation of set X, containing consecutive odd integers? (1) Set consists of 10 elements (2) The range of set is 18 Source: Others | Difficulty : Medium* * IMO the question can get tricky depending on the approach taken, nevertheless a good question.
PS Question 1 - Jan 25 40 skilled employees need 60 days to complete a project while working in the normal work schedule of 8 hours a day. They begin working but one month into the project, 30 employees need to shift to a different project. These 30 employees are replaced by 40 new employees who are 50% less productive. How much extra time per day should the new team work to avoid any delay in the completion of the project?
A. 10 hours 40 minutes
B. 10 hours 20 minutes
C. 6 hours 30 minutes
D. 2 hours 40 minutes
E. 2 hours 20 minutes
Source:
Expert’s Global | Difficulty: Hard
DS Question 1 - Jan 25 Ed has some fish, and the combined weight of all the fish is 100 pounds. The weights of the fish are all different. Ed gives the 3 heaviest fish to Ann, the 2 lightest fish to Bob, and the remaining fish to Carol. If the combined weight of the 3 heaviest fish is 50 pounds, how many fish does Carol receive?
(1) The combined weight of the fish Carol receives is 30 pounds.
(2) The combined weight of the fish Bob receives is 20 pounds.
Source: GMATPrepNow | Difficulty: Hard