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from gmatprep

This topic has 2 member replies
d77 Newbie | Next Rank: 10 Posts Default Avatar
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Posted:
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from gmatprep

Post Wed Dec 13, 2006 6:20 am
If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k

1. k>35
2.the unit sigit of k is greater then 5


why is
2

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d77 Newbie | Next Rank: 10 Posts Default Avatar
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Post Thu Dec 14, 2006 11:15 am
Very Happy

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zipper123 Newbie | Next Rank: 10 Posts Default Avatar
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Post Wed Dec 13, 2006 7:14 am
d77 wrote:
If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k
1. k>35
2.the unit sigit of k is greater then 5
why is
2
1) is not sufficient, because the k can be 37 or 42, which does not provide a unique answer.

Whereas:
2) consider the followings:
If the unit digit is less then 5,
--> k's tens digit is 4
if the unit digit is more than 5,
--> k's tens digit is 3

Therefore condition 2) is sufficient, because it restricts the tens digit to be 3 only.

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