Aptitude - Problems on H.C.F and L.C.M - Discussion

Guys, I have an idea over here for quick solution of this problem at first, 128352/238368 = 0.53 find this fraction value by dividing the stuff given in the question and then from all the options of answer divide each of them and find the fraction like 3/4 = 0.75 and so on for other four and finally when the decimal value matches with the above found value it is the answer i.e is 7/13 = 0.53, that's it.

Thanks for giving the easy method @Vaishak.

Thanks @Sona.

Thanks for giving an easy solution @Vaishak.

Please explain with easy method.

How to get 18336? Please explain.

@All.

Simply it can be solved by;

Goto the Option wise and use divisibility Rule.

1) Option "C" is Correct

Rule of Divisible 7 :- The difference the two alternate group take in 3 digits at a time should either be 0 or 7

Rule of 13 : difference between Alternate group 3digit which is Divisible 13..


As per rule 128352:-
352 224/7 = Reminder is 0
- 128
-----------
224

Therefore 7 is divisible by NUMERATOR.

(238268):-
368 130/13
- 238 (13 is divisible by NUMERATOR)
----------
130
Therefore 13 is Divisible by DENOMINATOR.

So, options C is the Right Answer.

Can anyone explain the solution in another method to get it easily?

@Sanket Shinde.

Why you multiply 7 &6? Explain.

7*6=42.
13*6=78.

Just see unit digit number it's 2 and 8 respectively so my answer is 7/13 only.