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# If N is a positive integer, is the units digit of N equal to

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Joined: 12 Nov 2007
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If N is a positive integer, is the units digit of N equal to [#permalink]  12 Nov 2007, 19:58
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If N is a positive integer, is the units digit of N equal to zero?

(1) 14 and 35 are factors of N

How can we determine from the factors above that the units digit of N is zero?
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Joined: 25 Jul 2007
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Consider the prime factors of 14 i.e. 14=2*7
Consider the prime factors of 35 i.e 35=5*7

If the given number has 14 & 35 as its factors, it should be divisible by 2*5*7

i.e 10 * 7

Basically, the given number is a multiple of 10 and therefore the units digit must be a zero.
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