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24 Jul 2008, 15:46
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My friend made this up...
How old is Kay?
1. Kay is fifteen years older than Michael was two years ago
2. Michael is half as old as Kay was two years ago.
I got C, but I can't seem to calculate how...
How old is Kay?
1. Kay is fifteen years older than Michael was two years ago
2. Michael is half as old as Kay was two years ago.
I got C, but I can't seem to calculate how...
Archived Topic
Hi there,
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24 Jul 2008, 16:22
Kudos
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NM. Brain fart.
So it's C,
1) k-2 = m + 15
2) m = k/2 -2
so from 2) k = 2m - 4
Combined:
2m -4 -2 = m + 15
m = 15 + 6
m = 21 (15+6)
k = 38 (42-4)
Check:
k -2 = 36
m = 21 + 15 = 36
21 - 2 = 38/2
19 = 19
So it's C,
1) k-2 = m + 15
2) m = k/2 -2
so from 2) k = 2m - 4
Combined:
2m -4 -2 = m + 15
m = 15 + 6
m = 21 (15+6)
k = 38 (42-4)
Check:
k -2 = 36
m = 21 + 15 = 36
21 - 2 = 38/2
19 = 19
25 Jul 2008, 07:58
Kudos
Bookmarks
Simple qns.
Its easy to see that each statement is not sufficient to answer the question.
Thus lets form equations for each statement.
Let the age of Michael be M and that of Kay be K
From 1
K-15= M-2
From 2
K - 2 = 2(M)
Solving for M
Answer M=11
Thus C.
Its easy to see that each statement is not sufficient to answer the question.
Thus lets form equations for each statement.
Let the age of Michael be M and that of Kay be K
From 1
K-15= M-2
From 2
K - 2 = 2(M)
Solving for M
Answer M=11
Thus C.
