Discussion :: Numbers - General Questions (Q.No.65)
|Soniya said: (Jul 1, 2011)|
|Sir, I am unable to solve this, because when x=6 then we get 27 which is divided by 9 not by 8, then how answer is x=6.|
|Faizal said: (Feb 24, 2012)|
|The divisibility rule for 8 is :
You have to take the last 3 digit no and divide it by 8 if it is divisible by then the no will be divisible by 8.
Hope you understood.
|Rajasekar said: (Nov 7, 2014)|
|There is a simple way:-
72 is a multiple of 3, since 42573x is divisible by 72 (given).
Hence: 4+2+5+7+3+x = 21+x (which must be a divisible by 3).
From the given options 6 is the only option which fits in place of x to satisfy the above criteria.
Hope you understood.
|Ashith said: (Jan 9, 2015)|
|72 = 2^3+3^2.
Apply divisibility rule of 2 and 3 on 42573x.
4+2+5+7+3+x = 21+x should be divisible by 3 if and only if x is 6.
|Rampavan said: (Mar 8, 2015)|
|Good problem and Easy for solving is also available.|
|Ritvik said: (Aug 12, 2015)|
|If you count the digits except * it comes to be 21. Now place one by one options and add it up and check the divisibility by 3.
Only option C and D satisfies but option D doesn't satisfy divisibility rule of 9. Clearly answer is 6 i.e. option C.
|Koti Ch said: (Mar 4, 2016)|
|May I know about co prime numbers?|
|Saravanan said: (Mar 4, 2016)|
72 is always divisible by(9*8),
Note: always take the minimum value here min value is : 8.
Now take the last 3 digits and place 8 in place of 'x'.
Then use all the given options,
Ex: 73* => 738/4 it will not give. So by the way we can get only by using 6.
i.e: 738/6 = 123.
Hence the answer: 6.
|Atul said: (Jul 21, 2016)|
|72 is known that is divisible by 3.
And any number, multiplied by 72 will be even.
And, 4 + 2 + 5 + 7 + 3 = 21, which is divisible by 3 "known".
We need to find an option from rest of the options which is even and divided by 3.
|Shree said: (Jul 5, 2017)|
|Pankaj Verma 9041939259 said: (Nov 15, 2017)|
|73x is divisible by 8 is, x = ?
First divide 73/8.
8x9 = 72 remainder 1.
73 1 X we need 6(1 is remainder while dividing 73 with 8 after remainder we have to put the value of X).
1X/8 as we know 16/8 so X is 6.
|Vinod said: (Feb 7, 2019)|
|Why should a take 6 and 73x?|
|Arun Prasanth V said: (Feb 9, 2019)|
|42573* ÷ 72,
First we do,
72 = 9*8.
The sum of num 42573* is divisible are not divisible by 9,
4+2+5+7+3+x = 21+x,
Now see we take 6 to add and then the number is divisible,
21+6= 27 now it is divided so the x =6.
|Nandini said: (Sep 28, 2019)|
|How 6 will be the answer? please explain.|
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