Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 1 (Q.No. 16)
Directions to Solve
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?
Answer: Option
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.
Discussion:
83 comments Page 3 of 9.
Ravi said:
1 decade ago
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.
VIKAS DHIMAN said:
1 decade ago
80,70,60,50-> A series with decreasment of 10.
10,15,20,25-> A series with increasment of 5.
10,15,20,25-> A series with increasment of 5.
Jyothi ravi said:
10 years ago
It can also be done in another way:
/8, *7, /5, *4, /3.
I mean 80/8, 10*7, 70/5, 15*4, 60/3.
So the answer is 20.
/8, *7, /5, *4, /3.
I mean 80/8, 10*7, 70/5, 15*4, 60/3.
So the answer is 20.
Francois said:
8 years ago
80, 70, 60 divided 5 gives first series 16, 14, 12...
10, 15 ?
10= 5*2.
15= 5*3.
20=5*4 my answer is 20.
10, 15 ?
10= 5*2.
15= 5*3.
20=5*4 my answer is 20.
Swapna said:
2 years ago
The series like {a1,b1,a2,b2,a3,.......}
Here
a2 = a1 - 10;
b2 = b1 + 5;
b4 = b3 + 5 i.e 15+5=20.
Here
a2 = a1 - 10;
b2 = b1 + 5;
b4 = b3 + 5 i.e 15+5=20.
(8)
Jainesh Doshi said:
1 decade ago
80-10-70-15-60-20-50-25-40-30-30-35-20-40-10-45.
(80-100) = 20.
20/2 = 10.
(70-100) = 30.
30/2 = 15.
(80-100) = 20.
20/2 = 10.
(70-100) = 30.
30/2 = 15.
PRIYA said:
1 decade ago
That is 80-10 = 70 & 70-10 = 60.
Similarly, 10+5 = 15 & 15+5 = 20.
So the answer is 20.
Similarly, 10+5 = 15 & 15+5 = 20.
So the answer is 20.
Amit said:
10 years ago
@Anil.
As I think your answer is "2".
1, 4, 5, 6, 7, 8, 9, 11.
2, 10, 11, 12, 13, 14, 15, 22.
As I think your answer is "2".
1, 4, 5, 6, 7, 8, 9, 11.
2, 10, 11, 12, 13, 14, 15, 22.
Neha said:
9 years ago
80,_70_60_50_(decrease series.) in 10 table.
10 15 20 25( increase series) in 5 table.
10 15 20 25( increase series) in 5 table.
Ravindra said:
8 years ago
The 1st pattern like 80-70-60 here added 10.
Now, the 2nd pattern 10-15-20 here added 5.
Now, the 2nd pattern 10-15-20 here added 5.
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