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From MitDavidDv: Prime Factor Question

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From MitDavidDv: Prime Factor Question [#permalink] New post 01 Jun 2011, 13:10
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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
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Re: From MitDavidDv: Prime Factor Question [#permalink] New post 01 Jun 2011, 13:40
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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] New post 01 Jun 2011, 14:10
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] New post 01 Jun 2011, 15:08
different prime factors of 550 are 2 , 5, 11

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

Answer is E.
Re: From MitDavidDv: Prime Factor Question   [#permalink] 01 Jun 2011, 15:08
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