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25 Dec 2014, 13:52
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
62% (01:47) correct
38%
(01:46)
wrong
based on 573
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History
Date
Time
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A single filter reduces the concentration of harmful substances in water by half. If water with less than 0.1 percent harmful substances is deemed clean, minimum of how many filters are needed to purify 200 liters of water that contains 0.5 liters of these substances?
A. 2
B. 3
C. 5
D. 6
E. 8
A. 2
B. 3
C. 5
D. 6
E. 8
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25 Dec 2014, 15:26
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First calculate the concentration of the contaminated water:
0.5l/200l * 100 = 0.25%
Every filter then reduces the concentration by half:
The first filter will bring the concentration down to 0.125%. A second one will bring it down to 0.0625%. A concentration that is below the 0.1% that is considered save. Answer A is correct.
0.5l/200l * 100 = 0.25%
Every filter then reduces the concentration by half:
The first filter will bring the concentration down to 0.125%. A second one will bring it down to 0.0625%. A concentration that is below the 0.1% that is considered save. Answer A is correct.
qw1981
Joined: 27 Jan 2013
Last visit: 01 Jun 2015
Posts: 169
Given Kudos: 8
Location: United States
Concentration: Entrepreneurship, Marketing
Schools: Johnson '16 (S) Anderson '16 (S) McCombs '16 (WL) IESE '16 (II) Tepper '17 (WA) LBS '17 (S) Kenan-Flagler '17 (A)
GMAT 1: 730 Q49 V40
GPA: 3.5
WE:Supply Chain Management (Telecommunications)
Schools: Johnson '16 (S) Anderson '16 (S) McCombs '16 (WL) IESE '16 (II) Tepper '17 (WA) LBS '17 (S) Kenan-Flagler '17 (A)
GMAT 1: 730 Q49 V40
Posts: 169
25 Dec 2014, 20:02
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o.1% of 200 litres is 0.2litres. We are given that current harmful substances is 0.5l. using 1st filter will reduce it to 0.25l and using the second will bring it down to 0.25l.
Thus answer is A.
Thus answer is A.
