In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much
16.
Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
[A].
20
[B].
25
[C].
30
[D].
50
Answer: Option B
Explanation:
This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.
This series contains the following 2 series alternatively.
80 70 60 50 ---> A series with decrement of 10
10 15 20 25 ---? A series with increment of 5
Hope your understand. Have a nice day guys!
Prasanna said:
(Mon, Oct 4, 2010 08:23:39 AM)
Thank for your explanation.
Rohit T George said:
(Sat, Nov 13, 2010 12:21:17 PM)
Thanks a Lot!!
Udayvenkat said:
(Mon, Dec 20, 2010 01:03:42 AM)
First 80, 10 is subracted it comes to 70 then to the previous 10 add 5 then again sub 10 from 70 it comes to 60 then again to the previous 15 add another 5 it comes to 20.
Here he mentioned all the questions and answere
80,10,70,15,60,20,50,25..........
Sulekha said:
(Tue, Mar 22, 2011 08:12:15 AM)
Thanks for explanation.
Shweta said:
(Thu, Apr 21, 2011 07:20:35 AM)
80,10,70,15,60,
nw we hav to seperate this
80,70,60,50,
[this is decresed by 10]
10,15,20,
[this is increased by 5]
nw compare both which hav least num at the end.20 is the ans
Ravi said:
(Wed, Apr 27, 2011 03:27:19 PM)
Thanks to all of u, who have done splendid job by sharing with each other. Truly this is a real place of collaboration, hatsoff to all.
Samstarnovi said:
(Sun, May 8, 2011 05:52:59 AM)
Its very easy guys-
80-10=70
10=5=15
and so on.
Gilbert said:
(Wed, May 18, 2011 01:55:41 PM)
Thanks for your help! I've never understood this since middle school.
Vikas Dhiman said:
(Sun, May 22, 2011 02:33:44 AM)
80,70,60,50-> A series with decreasment of 10.
10,15,20,25-> A series with increasment of 5.
Saba Marium said:
(Fri, Jun 17, 2011 11:14:59 AM)
Thanks for explaining.
Sushree Sonali said:
(Fri, Jun 24, 2011 02:16:22 AM)
Thanks sundar. Your explanation really helps me to know the answer.
Ravi Kumar said:
(Sun, Dec 18, 2011 01:26:16 PM)
Thanks sundar
Anil said:
(Thu, Apr 5, 2012 12:18:40 PM)
Please tell me next number in the series 1, 4, 5, 6, 7, 8, 9, 11, ?
