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How many positive integers are both multiples of 4 and divisors of 64

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How many positive integers are both multiples of 4 and divisors of 64  [#permalink]

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New post 21 Jun 2018, 02:38
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

54% (01:07) correct 46% (01:17) wrong based on 90 sessions

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Re: How many positive integers are both multiples of 4 and divisors of 64  [#permalink]

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New post 21 Jun 2018, 02:43
2
D
DIVISORS of 64 - 1,2,4,8,16,32,64
out of these only 4,8,16,32,64 are the multiples of 4 so answer should be 5

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Re: How many positive integers are both multiples of 4 and divisors of 64  [#permalink]

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New post 21 Jun 2018, 03:47
1
It's all the powers of 2 smaller than or equal to 64, minus 2 itself.

64 is 2^6, so not taking into account 2 itself, we have 5 powers, or 5 numbers that fit the bill.

Hence the answer is D.
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Re: How many positive integers are both multiples of 4 and divisors of 64  [#permalink]

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New post 21 Jun 2018, 06:43
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Re: How many positive integers are both multiples of 4 and divisors of 64  [#permalink]

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New post 11 Aug 2019, 19:21
Bunuel wrote:
How many positive integers are both multiples of 4 and divisors of 64 ?

(A) Two

(B) Three

(C) Four

(D) Five

(E) Six


Divisors of 64 are 1, 2, 4, 8, 16, 32 and 64, all of which are multiples of 4 except 1 and 2. So there are 5 positive integers that are both multiples of 4 and divisors of 64

Answer: D
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Re: How many positive integers are both multiples of 4 and divisors of 64   [#permalink] 11 Aug 2019, 19:21
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