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03 Jan 2016, 12:30
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D
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Difficulty:
35%
(medium)
Question Stats:
73% (02:09) correct
27%
(02:25)
wrong
based on 147
sessions
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Jim is now twice as old as Fred, who is two years older than Sam. Four years ago, Jim was four times as old as Sam. How old is Jim now?
A. 8
B. 12
C. 16
D. 20
E. 24
A. 8
B. 12
C. 16
D. 20
E. 24
06 Jan 2016, 12:07
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j=2f........(i)
f=s+2................(ii)
four years ago so
j-4=4(s-4)
putting (ii) in (iii)
we get j-4 =4(f-2-4)
putting (i) in above equation we get
j-4=4(j/2-6) =>j=20 (d)
f=s+2................(ii)
four years ago so
j-4=4(s-4)
putting (ii) in (iii)
we get j-4 =4(f-2-4)
putting (i) in above equation we get
j-4=4(j/2-6) =>j=20 (d)
06 Jan 2016, 12:10
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Let Jim's present age = J
Fred's present age = F
Sam's present age = S
J=2F
F= S+2
=>2F = 2S+4
=> J = 2S+4 --1
J-4 = 4*(S-4)
=>J-4 = 4S - 16
=> J = 4S -12 --2
From equations 1 and 2 , we get
2S+4 = 4S - 12
=> 2S = 16
=> S = 8
J = 32-12 = 20
Answer D
Fred's present age = F
Sam's present age = S
J=2F
F= S+2
=>2F = 2S+4
=> J = 2S+4 --1
J-4 = 4*(S-4)
=>J-4 = 4S - 16
=> J = 4S -12 --2
From equations 1 and 2 , we get
2S+4 = 4S - 12
=> 2S = 16
=> S = 8
J = 32-12 = 20
Answer D
