Author Topic: Logical mathematical reasoning/Razonamiento lógico matemático. x7  (Read 2468 times)

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Offline AdrenalineXV

And we are at it again.

What is the lowest number that multiplied by 18 gives a perfect cube as a product?  Regards.

¿Cuál es el menor número que multiplicado por 18 da un cubo perfecto como un producto?  Saludos cordiales.


Offline [MAF]mooman

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Re: Logical mathematical reasoning/Razonamiento lógico matemático. x7
« Reply #1 on: April 07, 2015, 11:49:48 pm »
18 is 2*3*3 so the lowest perfect cube containing it would be 2*2*2*3*3*3 = 216 meaning you have to multiply it by 2*2*3 = 12.
will read and answer your forum PMs when I'm less busy!

Offline AdrenalineXV

Re: Logical mathematical reasoning/Razonamiento lógico matemático. x7
« Reply #2 on: April 08, 2015, 01:00:36 am »
18 is 2*3*3 so the lowest perfect cube containing it would be 2*2*2*3*3*3 = 216 meaning you have to multiply it by 2*2*3 = 12.
Thank you mooman, but I do not get it. I just understand 18 is 2*3*3, but why do you go to 2*2*2*3*3*3 = 216? Regards.

Offline [MAF]mooman

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Re: Logical mathematical reasoning/Razonamiento lógico matemático. x7
« Reply #3 on: April 08, 2015, 01:42:33 am »
A perfect cube must have each of its factors repeated 3 times. It could also be written as (2*3)^3=6^3.
will read and answer your forum PMs when I'm less busy!

Offline AdrenalineXV

Re: Logical mathematical reasoning/Razonamiento lógico matemático. x7
« Reply #4 on: April 08, 2015, 03:47:58 am »
A perfect cube must have each of its factors repeated 3 times. It could also be written as (2*3)^3=6^3.

Ok, thank you. I will study this topic later to understand it the best.

Offline S

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Re: Logical mathematical reasoning/Razonamiento lógico matemático. x7
« Reply #5 on: April 08, 2015, 09:53:54 am »
stop spam soon pls