Aptitude - Odd Man Out and Series - Discussion

Insert the missing number.

7. 

8, 24, 12, 36, 18, 54, (....)

[A]. 27
[B]. 108
[C]. 68
[D]. 72

Answer: Option A

Explanation:

Numbers are alternatively multiplied by 3 and divided by 2.

So, the next number = 54 ÷ 2 = 27.


Tarun said: (Sep 6, 2011)  
I got 72.

24+12 = 36
36+18 = 54
and
54+18 = 72

Is this correct?

Sundar said: (Sep 12, 2011)  
Hi Tarun

You are wrong. Then what about other numbers previous to 36 (8, 24, 12) ?

Let me explain in detail.

...
16 / 2 = 08
08 x 3 = 24
24 / 2 = 12
12 x 3 = 36
36 / 2 = 18
18 x 3 = 54
54 / 2 = 27 [The required answer]
27 x 3 = 81
...

I hope this will help you. Have a nice day!

Nandha said: (Oct 18, 2011)  
I have a suggestion. We can also add the 3rd and 5th numbers to get the previous numbers example.

8,24,12,36,18,54 - 8,24,12 = 12+12 = 24 to get 24 in the 1st series

then 36,18,54 = 18+18 to get 36 then 3rd series 27+27 = 54.

Sowjanya said: (Oct 28, 2011)  
It is difficult to find yar, to add alternate numbers and guess the other number and to add those number. It is very difficult. Nandha and explanation of Sundar was right. Good Explanation Sundar.

Raghu said: (Nov 4, 2011)  
Well said sowjanya. Sunder's explanation was really simle and helpful.

Sarthak said: (Jan 7, 2012)  
I know how to do it.

8*3=24,
24/2=12,
12*3=36,
36/2=18,
18*3=54,
so 54/2=27.

Vinay Verma said: (Mar 26, 2012)  
8*3=24
12*3=36
18*3=54
24*3=72
72 ITS RIGHT ANS......

Ashok said: (Aug 26, 2012)  
8, 24, 12, 36, 18, 54, (....)

8*3=24, 8+4=12....by adding 4
12*3=36, 12+6=18...by adding 4+2=6
18*3=54, 18+9=27...by adding 6+3=9
...by adding 9+4=13 and so on.by increasing nos.like 2,3,4,5 and so on .
1st number*3=24
2nd number*3=36
3rd number*3=54
4th number*3=???

Meenali said: (Aug 14, 2013)  
2 series are there:

8,12,18,.... and 24,36,54.....

8+3 = 12.
12+6 = 18.
18+9 = 27.

Multiples of 3 are added.

Rajesh said: (Aug 18, 2013)  
Hi @Meenali.

I would like to aries one question how?

8+3 = 12 can you explain me please?

Hanumanth said: (Nov 28, 2013)  
8, 24, 24/2 = 12, 36, 36/2 = 18, 54, 54/2 = 27.

Vijay Kumar Sharma Lnct Bhopal said: (Jan 17, 2014)  
Here the next term is twice the previous term like 24 is just twice of 12 and 36 just twice of 18 so 54 is just twice of 27 so answer is 27.

Abhijit said: (Feb 8, 2014)  
8, 24, 12, 36, 18, 54, (....)

8*3 = 24%2 = 12;
12*3 = 36%2 = 18;
18*3 = 54%2 = 27;

So answer is 27.

Abdur Rehman said: (Feb 10, 2014)  
It's so easy just see if 2nd digit comes in 1st digit table and then keep same series for other numbers. For example 24 comes in table of 8 so 8 into 3 will be 24. If we divide 24/2 then it will be 12. If 12 multiplied by 3 then it will be 36. 36 divide by 2 it will become 18. 18 multiplied by 3 will be 54. 54/2 will be 27. So answer will be 27.

Koti said: (Jun 27, 2015)  
We can take 2 series.

8, 12, 18, 26 with 4, 6, 8 differences.

24, 36, 54, 78 which is multiple of 3 for above terms?

Arvind said: (Sep 2, 2015)  
8, 24, 12, 36, 18, 54, (...).

8*3 = 24%2 = 12;

12*3 = 36%2 = 18;

18*3 = 54%2 = 27;

So answer is 27.

Siddik said: (Mar 16, 2016)  
8*3=24, 24/2=12.
12*3=36, 36/2=18.
18*3=54, 54/2=27.

27 is the right answer.

Bhavana said: (Nov 9, 2016)  
18 : 81 :: 36 : ?

Please tell me the answer with logic.

Shruthi said: (Nov 16, 2016)  
Thank you @Sundar.

Aman said: (Feb 23, 2017)  
6 8 7
3 64 4
24 48 X
X =? S

Please solve this.

Somnath said: (Feb 25, 2017)  
6 8 7
3 64 4
24 48 ?

Please solve it.

Harish Manen said: (Apr 29, 2017)  
12-8 = 4 * 6 = 24.
18-12 = 6 * 6 = 36.
27-18 = 9 * 6 = 54.
So, 27 is the answer.

Mohit said: (Jun 12, 2017)  
Find the missing value and complete the matrix series.

6 8 7
3 64 4
24 48 ?

Dhiraj said: (Jul 2, 2017)  
@Somnath and @Aman.

Answer is 30.

Ashwini said: (Jul 6, 2017)  
Explain, please. How it will be 30?

Charan said: (Jul 6, 2017)  
@Dhiraj.

How it's 30?

Pralipsa said: (Jul 9, 2017)  
6 8 7
3 64 4
24 48 ?

How the answer is 30? Please explain.

Om Prakash said: (Jul 11, 2017)  
@Bhavana.

18:81:: 36:?

?=63 because of exchange position of the digit.

Ashutosh Pandey said: (Jul 18, 2017)  
@Mohit.

6 8 7
3 64 4
24 48 ?

42 will be answer
Be concentrated on first and last member.
6x2 = 12
12x3 =36
36-12= 24


8x2= 16
16x4= 64
64-16= 48

In same manner :
7*2= 14
14*4= 56
56*14 = 42

Towfiq said: (Aug 12, 2017)  
It's 30.

On each Row,
7mod(1st column +2nd column) = 7mod(3rd column),
For 1st row, 7 mod(6+8)=7 mod(7),
For 2nd row, 7 mod (3+64)=7 mod(4),
For 3rd row, 7 mod(24+48)=7 mod(30).

Sourabh said: (Mar 7, 2018)  
8 9 17 26 90 ?

Please help me guys, I'm not getting.

Sanju said: (Dec 24, 2018)  
6, 8, 7
3, 64, 4
24, 48, ?

Can anyone solve this?

Kiran said: (Jan 31, 2019)  
8*3=24 12*2=24
12*3=36 18*2=36
18*3=54 x*2 = 54.
i.e, x=54/2 = 27.

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