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How many positive integers less than 1000 are multiples of 5

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How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 14 Apr 2007, 23:34
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How many positive integers less than 1000 are multiples of 5 but NOT of 4 or 7?

(A) 114
(B) 121
(C) 122
(D) 129
(E) 136
[Reveal] Spoiler: OA

Last edited by Bunuel on 30 Apr 2015, 03:34, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 15 Apr 2007, 01:42
kevincan wrote:
How many positive integers less than 1000 are multiples of 5 but NOT of 4 or 7?

(A) 114 (B) 121 (C) 122 (D) 129 (E) 136


There are 1000/5=200 multiples of 5 . now we have to find the number of multiples of 5 and 4 that is 20 between 0 to 1000 and 5 and 7 that is 35 between 0 to 1000.

multiples of 20=1000/20=50 multiples. and multiples of 35= 1000/35 =28.5 so 28 multiples of 35.

So multiples of 5 between o to 1000 not including multiples of 20 and 35 are equal to 200-78 = 122 multiples.
So the answere is C.

Javed.

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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 15 Apr 2007, 06:48
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It's 129 (D)

There are 199 multiples of 5 that are less than 1000.

Now we have to exclude the multiples of 4 and 7 from these 199 numbers.

Let's first find out the numbers below 1000 that are multiples of 5 as well as 4. (that is, multiples of 20). There are 49 such numbers.

Ditto for 5 as well as 7. There are 28 such numbers.

Subtracting these numbers from 199, we get, 199-49-28=122.

However, there will be some numbers which are multiples of both 4 and 7 which have been subtracted twice in the above calculation.

There are 7 such numbers (multiples of 20 as well as 35, that is multiples of 140).

Thus the required number is 122+7 = 129.
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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 15 Apr 2007, 06:49
Javed's method seems to be straight forward and correct.

Although in a counting problem such as this, B is tempting because it's very close to C and it might make you think that you forgot to subtract 1 from somewhere...

What is the OA?
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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 15 Apr 2007, 10:08
rakesh.id wrote:
It's 129 (D)

There are 199 multiples of 5 that are less than 1000.

Now we have to exclude the multiples of 4 and 7 from these 199 numbers.

Let's first find out the numbers below 1000 that are multiples of 5 as well as 4. (that is, multiples of 20). There are 49 such numbers.

Ditto for 5 as well as 7. There are 28 such numbers.

Subtracting these numbers from 199, we get, 199-49-28=122.

However, there will be some numbers which are multiples of both 4 and 7 which have been subtracted twice in the above calculation.

There are 7 such numbers (multiples of 20 as well as 35, that is multiples of 140).

Thus the required number is 122+7 = 129.


I agree with your explanation. Answere is 129.

Javed

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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 15 Apr 2007, 12:12
multiples of 5: 5(1,2,3,4,5......, 199), 199 in total < 1000
multiples of 4 and 5: 20(1,2,3,4,5,....,49) 49 in total < 1000
multiples of 5 and 7: 35(1,2,3,4,5,....,28) 28 in total < 1000

199 - 49 - 28 = 122

The double counts include multiples of 20,35 (2*2*5, 7*5)
70,140,350,700,770,910,980

122 + 7(doubles) =129
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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 15 Apr 2007, 13:51
alfyG wrote:
multiples of 5: 5(1,2,3,4,5......, 199), 199 in total < 1000
multiples of 4 and 5: 20(1,2,3,4,5,....,49) 49 in total < 1000
multiples of 5 and 7: 35(1,2,3,4,5,....,28) 28 in total < 1000

199 - 49 - 28 = 122

The double counts include multiples of 20,35 (2*2*5, 7*5)
70,140,350,700,770,910,980

122 + 7(doubles) =129


I think the double counts given by you are incorrect. 70, for example, is not a multiple of 4 and 5.

The double counts are: 140, 280, 420, 560, 700, 840, 980
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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 15 Jun 2016, 23:50
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Did I understand the concept correctly?

To find multiples of a number X less that Y, we divide Y/X. If Y/X has no remainder then no. of multiples if Y/X - 1. If Y/X has remainder then no. of multiples is quotient of Y/X. Eg

no. of multiples of 5 less than 1000 = 1000/5 - 1=199. (If 1000 was included then we wouldnt have subtracted 1)
No. of multiples of 3 less than 1000 = 1000/3 = 333

To find common multiples of two nos U and V up to some no. W (eg common multiples of 20 and 35 less than 1000), we find the first common multiple (in this case 140). No all multiples of 140 less than 1000 would be common multiples of 20 and 35 less than 1000 (140, 280, 420, 560, 700, 840, 980, total 7)
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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 18 Jun 2016, 07:15
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multiple of 5 between 1 to 100 = (100-5)/5 + 1 = 20

multiple of 5&4 that is 20 between 1 to 100 = (100-20)/20 + 1 = 5

multiple of 5&7 that is 35 between 1 to 100 = (100-35)/35 + 1 = 2

Total multiple of 20 and 35 between 1 to 100 = 7

multiple of 5 between 1 to 1000 = 20*10 = 200

multiple of 20 and 35 between 1 to 1000 = 7*10 = 70

multiple of 5 BUT not of 4&7 between 1 to 1000 = 200-70 = 130

we need to subtract 1 because question asks less than 1000.

hence total multiple asked = 130-1 = 129
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How many positive integers less than 1000 are multiples of 5 [#permalink]

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New post 23 Aug 2016, 10:58
here is my approach ->
Multiples of 5=> 199
Multiples of 4 and 5 i.e of 20 => 49
Multiples of 7 and 5 i.e 35 => 28
Multiples of all 5,4,& i.e multiples of 140=> 7


[Reveal] Spoiler:
Required value => 199-49-28+7 => 129
Smash that D

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How many positive integers less than 1000 are multiples of 5   [#permalink] 23 Aug 2016, 10:58
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