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this would be explained on the basis of two FACTS below.......
sum of two odd numbers are always even and
sum of to even numbers are also always even
then how 6 odd numbers (consider 3 pairs, 9 5 3 1 being odd numbers) can make an odd number 21..!!
SO SIMPLE
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9999555533331111 whose 6 digits sum is 21?
You can't get six odd numbers to add to an odd number in this Universe, so... a little creative thinking (= "cheating") is needed... 3 + 3 + 3 + 1 + 11 uses 6 digits and the sum is 21... ... if you want to be REALLY "creative", turn one of the nines upside down and you could have 6 + 5 + 5 + 3 + 1 + 1...
What two digit number is 7 times the sum of its digits?
21
Name a number who's sum of digits less than 4?
21
Is 6618 divisible 3 6 and 9?
Yes, yes, and no. 3- sum of digits must be multiple of 3. 6- sum of digits must be multiple of 3 and number must be even (multiple of 2). 9- sum of digits must be multiple of 9. (The sum of the digits here is 21.)
What are the rules dividing by 3?
If the sum of the digits of the number is a multiple of 3 then that number is divisible by 3. For example: 156351 The sum of the digits is 1+5+6+3+5+1 = 21 which is divisble by 3 156351/3 = 52117
