Aptitude - Numbers - Discussion

Why we are adding the given all digits ?

How can we divide (22+x) by 3 ?

Not understanding me explain me properly.

hi..
the rule for division for 3 is the total of the given number should be divided by 3..
so when add 517x324=22 which can't be divided by 3, so we have to add 2, to make it dividable by 3.

after adding 2 it becomes 24 which can be divided by 3.

hope it helps u..

I can't understand anyones explaination. If any one got this sum means please explain it clearly.

Hi @Pavani..

If a number(for example take xyzpqr) is divisible by 3, then the sum(x+y+z+p+q+r) is also divisible by 3 and vice versa..

ex: 243 is divisible by 3
2+4+3=9 is also divisible by 3..

So if u want to check dat a number is divisible by 3 then it is enough to see whether the sum of digits in the number is divisible by 3..

Hi Janu! can we set this formula with every number?

Let x
and chosen number form option
and 22 + 2 = 24
it.s divided by 8 so answer is 2

Hi paavani..

Principle: If a number is divisible by 3 means, sum of the digits also divisible by 3.

For eg: take 12. we know that 12 is divisible by 3
sum of digits i.e 1+2 = 3 ,3 is divisible by 3.

First u clear about this?

We cum to problem then..
517*324 is completely divisible by 3
so sum of the digits also divisible by 3.

Then, 5+1+7+x+3+2+4 = 22+x

We hav given the options 0, 1 , 2

If x=0, sum= x+22= 0+22 = 22 is not divisible by 3
If x=1, Sum =x+22 = 1+22 = 23 is not divisible by 3
If x=2, Sum =x+22 = 2+22 = 24 is divisible by 3
So answer is 2

Hope you understand this..

How can we divide (22+x) by 3 ?