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 6 of 9.
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.
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.
Nandini said:
1 decade ago
80 70 60 is the 1st order series it decrease 10.
80-10 = 70.
70-10 = 60.
10 150 is second order series it increase 5.
10+5 = 15.
15+5 = 20.
80-10 = 70.
70-10 = 60.
10 150 is second order series it increase 5.
10+5 = 15.
15+5 = 20.
Priya said:
1 decade ago
Its 80-10 = 70 in first series and 10+5 = 15 in second series and so on.
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.
Kotagunta Pavan Kumar said:
1 decade ago
Simple and nice explanation, and is enough.
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.
Ashish gupta said:
1 decade ago
First we see difference each one (80,10,70,15,60).
80-10,10-70, 70-15, 15-60.
70, 60, 55, 45(70-60) (60-55) (55-45).
First increase 10, second decrease 5, third increase 10.
So now decrease 5 (45-5)=40 so answer is 60-40= 20.
80-10,10-70, 70-15, 15-60.
70, 60, 55, 45(70-60) (60-55) (55-45).
First increase 10, second decrease 5, third increase 10.
So now decrease 5 (45-5)=40 so answer is 60-40= 20.
Alisha said:
10 years ago
80-10 = 70.
10+5 = 15.
70-10 = 60.
15+5 = 20.
Answer: 20.
10+5 = 15.
70-10 = 60.
15+5 = 20.
Answer: 20.
Pawan singh said:
1 decade ago
80 70 60 ..... 10, 15, then? 10+5 = 15+5 = 20 is the answer.
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