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Re: What is the sum of all the prime factors of 220 and 330? [#permalink]
Prime factorization of both the numbers is as follows
220 = 2 * 2 * 5 * 11
sum of the prime factors of 220 = 20
330 = 2 *3 * 5 * 11
sum of prime factors of 330 = 21
addition of both = 20 + 21 = 41
correct Answer - D
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Re: What is the sum of all the prime factors of 220 and 330? [#permalink]
stonecold wrote:
Very Confusing This question.
The answer can either be 41 or 21.
Here => What in sum of all the prime factors we are counting them twice and thrice.
Bit odd.

Regards
StoneCold


I suppose u factozied both together the way I did
lets try
220 330
11 20 30
2 10 15
5 2 3
11+2+5= 18 (not in the option)

Im doing something wrong
let me seprate & answer will be 41 :)
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Re: What is the sum of all the prime factors of 220 and 330? [#permalink]
220 =(2^2)(5)(11) --> sum = 20

330 =(2)(3)(5)(11) --> sum = 21

20+21 = 41

D.
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Re: What is the sum of all the prime factors of 220 and 330? [#permalink]
KarishmaB MartyMurray How can '4' be considered  a  prime factor here  ?  There must be  a typing error somewhere. Kindly check . bb , Bunuel
Skywalker18 wrote:
Prime factorization of the given numbers

220 = 2^2 * 5 * 11
330 = 2*3*5* 11

Sum = 4+5+11 + 2+3+5+11
=20 + 21
=41
Answer D

­
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Re: What is the sum of all the prime factors of 220 and 330? [#permalink]
Expert Reply
 
sayan640 wrote:
KarishmaB MartyMurray How can '4' be considered  a  prime factor here  ?  There must be  a typing error somewhere. Kindly check . bb , Bunuel
Skywalker18 wrote:
Prime factorization of the given numbers

220 = 2^2 * 5 * 11
330 = 2*3*5* 11

Sum = 4+5+11 + 2+3+5+11
=20 + 21
=41
Answer D
­

­4 is not a prime factor.

Notice that what's going on is that Skywalker18 used 4 to represent the two 2s in the prime factorization of 220.

So, the above is a little unclear, but it's basically correct.
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Re: What is the sum of all the prime factors of 220 and 330? [#permalink]
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