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Need math(s) help, please!
Posted: Wed Oct 29, 2008 4:21 pm
by mouse
Jake needs help with his homework, and I, I am embarrassed to admit, am clueless. This is 7th grade pre-algebra. He was absent on Monday and Tuesday so he's missed a couple lessons. Anyway, here is the question:
Two numbers are relatively prime. If the first number is multiplied by 3, the result is divisible by 6. Can the second number be an odd number? Explain your reasoning.
If anyone could explain this to us, we would be ever so grateful.
Thanks!
Re: Need math(s) help, please!
Posted: Wed Oct 29, 2008 5:16 pm
by mouse
It's ok, we've got our answer (I cheated on you all with the Curly board, and they were quicker with an answer - *gasp*).
Re: Need math(s) help, please!
Posted: Wed Oct 29, 2008 5:24 pm
by MdmeAlbertine
Then for pete's sake, post the answer!
I got as far as thinking the second number almost has to be an odd number, because the first number has to be an even number in order to be multiplied by three and still divisible by six, and if the first number is even, then the second number has to be odd, otherwise they'd both be divisible by two.
Re: Need math(s) help, please!
Posted: Wed Oct 29, 2008 5:45 pm
by mouse
MdmeAlbertine wrote:Then for pete's sake, post the answer!
I got as far as thinking the second number almost has to be an odd number, because the first number has to be an even number in order to be multiplied by three and still divisible by six, and if the first number is even, then the second number has to be odd, otherwise they'd both be divisible by two.
Yes.
Re: Need math(s) help, please!
Posted: Thu Oct 30, 2008 8:54 am
by MdmeAlbertine
Oh yeah, I still got it. [nods]
