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If x and y are positive integers

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Joined: 16 Jun 2018
Posts: 32
If x and y are positive integers  [#permalink]

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New post 28 Aug 2018, 21:32
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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\(^2- 6*y + 5 = 0\)
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Re: If x and y are positive integers  [#permalink]

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New post 28 Aug 2018, 21:38
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Re: If x and y are positive integers &nbs [#permalink] 28 Aug 2018, 21:38
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If x and y are positive integers

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