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Re: How many positive integers less than 1000 are multiples of 5 [#permalink]
15 Apr 2007, 00:42

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.

Re: How many positive integers less than 1000 are multiples of 5 [#permalink]
15 Apr 2007, 05:49

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...

Re: How many positive integers less than 1000 are multiples of 5 [#permalink]
15 Apr 2007, 11:12

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

Re: How many positive integers less than 1000 are multiples of 5 [#permalink]
15 Apr 2007, 12:51

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.

Re: How many positive integers less than 1000 are multiples of 5 [#permalink]
29 Apr 2015, 09:27

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