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23 Aug 2018, 23:37
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B
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k is a positive number. If k is twice its reciprocal, and j is twice k, then jk =
A. 2√2
B. 4
C. 4√2
D. 8
E. 8√2
A. 2√2
B. 4
C. 4√2
D. 8
E. 8√2
Chethan92
Joined: 18 Jul 2018
Last visit: 21 Apr 2022
Posts: 917
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Given Kudos: 95
Location: India
Concentration: Operations, General Management
Schools: IIMB EPGP'22 (M)
GMAT 1: 590 Q46 V25
GMAT 2: 690 Q49 V34
WE:Engineering (Energy)
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23 Aug 2018, 23:42
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Given K = 2(\(\frac{1}{K}\)).
\(K^2\) = 2.
K = \(\sqrt{2}\)
Now J = 2K
J = 2\(\sqrt{2}\).
JK = \(\sqrt{2}\)*2\(\sqrt{2}\)
JK = 4.
B is the answer.
\(K^2\) = 2.
K = \(\sqrt{2}\)
Now J = 2K
J = 2\(\sqrt{2}\).
JK = \(\sqrt{2}\)*2\(\sqrt{2}\)
JK = 4.
B is the answer.
23 Aug 2018, 23:44
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Bunuel
k is a positive number. If k is twice its reciprocal, and j is twice k, then jk =
A. 2√2
B. 4
C. 4√2
D. 8
E. 8√2
A. 2√2
B. 4
C. 4√2
D. 8
E. 8√2
Given k=2*(1/k)
Or, k^2=2
Given j=2*k
So, j*k=2k*k=2k^2=2*2=4
Ans. (B)
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