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If the units digit of the three-digit positive integer k is

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VP
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New post 17 Oct 2004, 00:06
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If the units digit of the three-digit positive integer k is nonzero, what is the tens digit of k?

(1) The tens digit of k + 9 is 3.
(2) The tens digit of k + 4 is 2
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New post 17 Oct 2004, 03:45
A is enough as we know the units digit is not equal to 0
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New post 17 Oct 2004, 08:12
It is A,

The maximum carry over that u can get by adding two digits is 1. So if k can be written as abc (a is 100's place, b is tens place and c is units place digit) then abc + 9 will definetly give a carry over of 1 since c is non zero. so b+1 = 3 and therefore b=2.

From the choice 2, abc + 4 can or cannot give a carry over at units place, so b can be either 1 or 2.
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New post 17 Oct 2004, 20:52
OA is A :done
  [#permalink] 17 Oct 2004, 20:52
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If the units digit of the three-digit positive integer k is

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