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

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Re: If the units digit of the three-digit positive integer k is nonzero [#permalink]

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New post 17 Aug 2017, 10:42
1) let number be 121,122,123,124,125,.....129
if 9 is added the tens digit changes to 3 therefore tens digit is 3. A/D
2) let number be 119 then adding 4 makes tens digit 2 but on other hand taking number 121 and adding 4 makes tens digit again 2 so insufficient.

A is the answer
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Re: If the units digit of the three-digit positive integer k is nonzero   [#permalink] 17 Aug 2017, 10:42
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If the units digit of the three-digit positive integer k is nonzero

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