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# What is the sum of the different positive prime factors of 550?

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What is the sum of the different positive prime factors of 550? [#permalink]  17 Dec 2007, 16:23
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What is the sum of the different positive prime factors of 550?

A. 10
B. 11
C. 15
D. 16
E. 18
[Reveal] Spoiler: OA

Last edited by Bunuel on 05 Mar 2015, 05:16, edited 1 time in total.
Renamed the topic, edited the question, added the OA and moved to PS forum.
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Re: What is the sum of the different positive prime factors of 550? [#permalink]  17 Dec 2007, 18:09
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mbsnyc wrote:
What is the sum of the different positive prime factors of 550?

550

55*10 --> 5*11*2*5 --> 5+11+2=18. Remember its asking for the DIFFERENT positive prime factors of 550.
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Re: What is the sum of the different positive prime factors of 550? [#permalink]  17 Dec 2007, 18:23
550 = 5*11*5*2

5+11+2 = 18
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Re: From MitDavidDv: Prime Factor Question [#permalink]  01 Jun 2011, 12:40
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MitDavidDv wrote:
What is the sum of the different positive prime factors of 550?
A. 10
B. 11
C. 15
D. 16
E. 18

$$550=275*2=25*11*2=5*5*11*2=5^2*11*2$$

Different prime numbers are 5, 11 and 2.

Sum=5+11+2=18

Ans: "E"
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Re: From MitDavidDv: Prime Factor Question [#permalink]  01 Jun 2011, 13:10
Shalom!

550= 5^2+2+11=18
The prime factors are 5, 2 and 11 therefore the answer is E.
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Re: From MitDavidDv: Prime Factor Question [#permalink]  01 Jun 2011, 14:08
different prime factors of 550 are 2 , 5, 11

=> sum of prime factors = 2+5+11 = 18

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Re: What is the sum of the different positive prime factors of 550? [#permalink]  05 Mar 2015, 00:48
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Re: What is the sum of the different positive prime factors of 550?   [#permalink] 05 Mar 2015, 00:48
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