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## from gmatprep

This topic has 2 member replies
d77 Newbie | Next Rank: 10 Posts
Joined
13 Dec 2006
Posted:
6 messages

#### from gmatprep

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

d77 Newbie | Next Rank: 10 Posts
Joined
13 Dec 2006
Posted:
6 messages
Thu Dec 14, 2006 11:15 am

zipper123 Newbie | Next Rank: 10 Posts
Joined
10 Oct 2006
Posted:
8 messages
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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