SOLUTION: How many positive integer factors of 360 are also multiples of 4?

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Question 1175732: How many positive integer factors of 360 are also multiples of 4?
Found 3 solutions by MathLover1, Alan3354, ikleyn:
Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!

The factors of are:
,,, , ,, , , , , , , , , , , , ,, ,, , ,
multiples of up to are:
, ,,,, , , , , ,,,,

How many positive integer factors of are also multiples of ?
answer: there are positive integer factors of that are also multiples of


Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
How many positive integer factors of 360 are also multiples of 4?
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I don't think there's a way to calculate that.
Just list them and count them.

Answer by ikleyn(52800)   (Show Source): You can put this solution on YOUR website!
.

            The solution by  @MathLover1 is incorrect.

            Her answer  " 14 "  is not correct.

            The numbers  16  and  32  of her list are not divisors of  360.

            I came to bring the correct solution.


360 = 4*90 = 8*45 = 8*3^2*5 = 4*(2*3^2*5).


All divisors of 360, that are multiples of 4, are the numbers of the primary decomposition  ,

where indexes m, n and k  vary independently in their ranges


    m = 0, 1     (two values)

    n = 0, 1, 2  (three values)

    k = 0, 1     (two values).


THEREFORE, the number of all positive divisors of 360, that are multiples of 4 is  2*3*2 = 12.    ANSWER

Solved.


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If you want to learn on how to calculate the number of divisors  d(N)  of a given integer number  N,  look into my lesson
    - Problems on divisors of a given number
in this site.

It is one of the basic introductory subjects of the elementary number theory.



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