divisibility

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divisibility

by sachindia » Sun Jul 08, 2012 1:57 am
If k is divisible by 6 and 3k is not divisible by 5, is k divisible by 10?

considering k as some no. ,ofcouse we could find it but
i am trying to understand the math behind it through definitions.
wouldn't want to substitute some no all the time whilst solving questions.
Please help.
Regards,
Sach
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by Anurag@Gurome » Sun Jul 08, 2012 2:40 am
sachindia wrote:If k is divisible by 6 and 3k is not divisible by 5, is k divisible by 10?
3k is not divisible by 5 ---> k is not divisible by 5

Hence, k is not divisible by 10.
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