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# If x and y are positive integers

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Manager
Joined: 16 Jun 2018
Posts: 52
If x and y are positive integers  [#permalink]

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28 Aug 2018, 21:32
1
00:00

Difficulty:

65% (hard)

Question Stats:

43% (02:02) correct 57% (02:29) wrong based on 7 sessions

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If x and y are positive integers and n = 5x + $$7^{(y+15)}$$, what is the units digit of n?

(1) y = 2x – 15
(2) y$$^2- 6*y + 5 = 0$$
Math Expert
Joined: 02 Sep 2009
Posts: 55802
Re: If x and y are positive integers  [#permalink]

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28 Aug 2018, 21:38
suelahmed wrote:
If x and y are positive integers and n = 5x + $$7^{(y+15)}$$, what is the units digit of n?

(1) y = 2x – 15
(2) y$$^2- 6*y + 5 = 0$$

Discussed here: https://gmatclub.com/forum/if-x-and-y-a ... 87302.html
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Re: If x and y are positive integers   [#permalink] 28 Aug 2018, 21:38
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