what is Sum of five odd number?

May 2012
79
0
Arizona
The question is:
What is sum of five odd numbers
a)Even
b)divisible by three
c)divisible by 5
d)a prime number
e)non of the above
The answer is none of above.
But i think the answer should be divisible by 5 because:
sum of x,x+2,x+4,x+6,x+8 is 5x + 20 which is always divisible by 5. Could anyone tell me what i am doing wrong here?
 
Jan 2011
83
2
odd number=o

if o+o=even
o+o+o=odd
continuing in this way

the conclusion we get is
sum of odd numbers, even number of times is even

and

sum of odd numbers, odd numbers of times is odd

so that is the only information given in the question.

can u proceed further now.
 
May 2008
1,024
409
Baltimore, MD (USA)
But i think the answer should be divisible by 5 because:
sum of x,x+2,x+4,x+6,x+8 is 5x + 20 which is always divisible by 5. Could anyone tell me what i am doing wrong here?
It never said that the odd numbers were consecutive. For example: 1 + 3 + 5 + 7 + 11 = 27 which is not divisible by 5.
 
May 2012
79
0
Arizona
@Reckoner. Yeah never noticed that. Thanks for pointing it out.
 
Jun 2012
616
115
AZ
The question is:

The answer is none of above.
But i think the answer should be divisible by 5 because:
sum of x,x+2,x+4,x+6,x+8 is 5x + 20 which is always divisible by 5. Could anyone tell me what i am doing wrong here?
Who said they have to be consecutive?

a) is obviously false, b), c) and d) are not necessarily true. So it's e) none of the above.
 
Apr 2012
42
1
Irving TX
Let the 1st number be x, then sum of 5 odd number would be:x, x+1,x+3,x+5,x+7,x+9= 5x+25
then x=25/5= 5.
Therefore, answer would be option (c).
 
Jun 2018
1
0
Dhaka
If you consider "x" as an odd number then if you add any even to x, the number will be odd.
Summing x,x+4,x+12,x+18,x+24
We get 5x+58. Which is not divisible by 3 or 5 and is not even or prime number. So none of the above is the answer.
 
Feb 2015
2,255
510
Ottawa Ontario
HEY, this thread is 6 years old! Why are you activating it?
Getting ready to do some spamming?