Math Is Fun Forum

daz

Member

Registered: 2006-09-22

Posts: 4

I'm just not sure, Help please

I'm new to the board, so be gentle. I'm just stumped on this one:

Who Am, I?

I am a number with the following properties:
•    if I am not a multiple of 4, then I am in between 60 and 69.
•    if I am a multiple of 3, I am between 50 and 59.
•    if I am not a multiple of 6, I am between 70 and 79.

What number am I?

thanks in advance

Chelsea

Member

Registered: 2005-06-16

Posts: 390

Re: I'm just not sure, Help please

Welcome to maths is fun!!

Is it 13, try this maths question 5x5-6+64=?

P.S This is easy i know i just wondering if you know!

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Theres no other place like home or is there..............

daz

Member

Registered: 2006-09-22

Posts: 4

Re: I'm just not sure, Help please

it's 83 to your question.

How did you arrive at 13?

Chelsea

Member

Registered: 2005-06-16

Posts: 390

Re: I'm just not sure, Help please

I dont know i just added 4, 6 and 3 but it probly wrong, that is a tough question, what is the answer and can you tell me how you worked it out?

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Theres no other place like home or is there..............

daz

Member

Registered: 2006-09-22

Posts: 4

Re: I'm just not sure, Help please

lol....I wish I knew the answer. I've charted this sucker out and looked at it til my eyes feel like they are going to bleed. I have no bloody clue, yet I'm sure it's probably something real obvious.

Chelsea

Member

Registered: 2005-06-16

Posts: 390

Re: I'm just not sure, Help please

Probly is any way heres a question for you  There are 6769 cars and they all need new tires how many new tires will there be needed?

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Theres no other place like home or is there..............

Chelsea

Member

Registered: 2005-06-16

Posts: 390

Re: I'm just not sure, Help please

do you know the answer?

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Theres no other place like home or is there..............

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Re: I'm just not sure, Help please

76

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"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

numen

Member

Registered: 2006-05-03

Posts: 115

Re: I'm just not sure, Help please

If it's a multiple of 3, it's between 50-59, but not all numbers between 50-59 are multiples of 3. Cancel out those numbers. For the rest between 50-59, how many are multiples of 4? Cancel out those who are not multiples of 4. You following so far?

Good. So what can you conclude now? Exactly, the number is not a multiple of 3 because none of the numbers between 50-59 remains. Cancel out all remaining numbers that are multiples of 3.

Remember, it has to be a number between 50-79, because it's the only definitions you've got.

Remove your second criteria, you've used it up already. Continue the same way with your other two criterias

Edit: Bah, Rod gave the answer away, lol.

Last edited by numen (2006-09-22 11:01:32)

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Bang postponed. Not big enough. Reboot.

daz

Member

Registered: 2006-09-22

Posts: 4

Re: I'm just not sure, Help please

Thanks for the help, I really appreciate it.

Last edited by daz (2006-09-22 11:03:29)

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Re: I'm just not sure, Help please

Edit: Bah, Rod gave the answer away, lol.

Sorry, I figured it out and couldn't help posting the answer.
I made a table of numbers vs multiples of {3,4,6} and narrowed it down.

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"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman