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If K is a positive integer, what is the units digit of K?

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If K is a positive integer, what is the units digit of K?  [#permalink]

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New post 21 Mar 2018, 05:25
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

74% (01:27) correct 26% (01:06) wrong based on 58 sessions

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If K is a positive integer, what is the units digit of K?  [#permalink]

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New post 21 Mar 2018, 05:39
Bunuel wrote:
If K is a positive integer, what is the units digit of K?

(1) The units digit of 2K is 6.
(2) The hundreds digit of 100K is 8.


1) unit digit of 2k is 6

k can have a unit digit of 3 or 8

2)

hundreds digits of 100k is 8
k can be 8
if k is 28
100k = 2800 hundreds digit is 8



if k is a 3 digit number 108

100k=10800
if k is 1008
100800

k has to have unti digit 8
(B) imo
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Re: If K is a positive integer, what is the units digit of K?  [#permalink]

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New post 21 Mar 2018, 12:08
Hatakekakashi wrote:
Bunuel wrote:
If K is a positive integer, what is the units digit of K?

(1) The units digit of 2K is 6.
(2) The hundreds digit of 100K is 8.


1) unit digit of 2k is 6

k can have a unit digit of 3 or 8

2)

hundreds digits of 100k is 8
k can be 8
if k is 28
100k = 2800 hundreds digit is 0



if k is a 3 digit number 108

100k=10800

k has to be single digit 8
(B) imo


Hey Hatakekakashi, Option C you mean? :-)
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If K is a positive integer, what is the units digit of K?  [#permalink]

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New post 21 Mar 2018, 12:37
Gladiator59 wrote:

Hey Hatakekakashi, Option C you mean? :-)


why c?

edited my answer a bit
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Re: If K is a positive integer, what is the units digit of K?  [#permalink]

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New post 21 Mar 2018, 12:46
Hatakekakashi wrote:
Gladiator59 wrote:

Hey Hatakekakashi, Option C you mean? :-)


why c?


My Bad! B it is... I think I mixed up between units digit of k and 100k.

Best,
Gladi
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Re: If K is a positive integer, what is the units digit of K?   [#permalink] 21 Mar 2018, 12:46
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