Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 1 (Q.No. 11)
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
11.
Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
Answer: Option
Explanation:
In this simple addition series, each number increases by 0.8.
Discussion:
45 comments Page 4 of 5.
Manthan (JAMLA GJ 9 ) said:
10 years ago
15, 23, 31, 39, ?
31-15 = 16.
39-23 = 16.
So 31+16 = 47.
31-15 = 16.
39-23 = 16.
So 31+16 = 47.
Sandeep said:
10 years ago
2.3-1.5 = 0.8.
2.3+0.8 = 3.1.
3.1+0.8 = 3.9.
3.9+0.8 = 4.7.
2.3+0.8 = 3.1.
3.1+0.8 = 3.9.
3.9+0.8 = 4.7.
Subhankar said:
10 years ago
Compare it carefully & you must find this.
Priyanka said:
1 decade ago
2.3-1.5 = 0.8.
2.3+0.8 = 3.1.
3.1+0.8 = 3.9.
3.9+0.8 = 4.7.
2.3+0.8 = 3.1.
3.1+0.8 = 3.9.
3.9+0.8 = 4.7.
Prasanth said:
1 decade ago
Compare to all the answers ANU explanation is super and clear that can able to understand the dull students also.
Pawan sharma said:
1 decade ago
1.5+0.8 = 2.3.
3.1+0.8 = 3.9.
3.9+0.8 = 4.7.
3.1+0.8 = 3.9.
3.9+0.8 = 4.7.
Kartik Ahuja said:
1 decade ago
Another solution is there.
Just add the digits of the individual number to once digit extent.
Like,
1+5, 2+3, 3+1, 3+9.
6, 5, 4, 3, now is 2 therefore option C is correct as 4+7=11 then 1+1=2 this complete the series.
Just add the digits of the individual number to once digit extent.
Like,
1+5, 2+3, 3+1, 3+9.
6, 5, 4, 3, now is 2 therefore option C is correct as 4+7=11 then 1+1=2 this complete the series.
Anu said:
1 decade ago
Take the series as 15, 23, 31, 39...
Adding 8 to the previous number will give the next no.
15+8=23
23+8=31
31+8=39
So, 39+8= 47 for the series 15, 23, 31, 39..
And 4.7 for the series 1.5, 2.3, 3.1, 3.9...
Adding 8 to the previous number will give the next no.
15+8=23
23+8=31
31+8=39
So, 39+8= 47 for the series 15, 23, 31, 39..
And 4.7 for the series 1.5, 2.3, 3.1, 3.9...
Varun said:
1 decade ago
We can make chain also. It is direct method.
3.1-1.5=1.6
3.1+1.6=4.7
3.1-1.5=1.6
3.1+1.6=4.7
Raji said:
1 decade ago
2.3-1.5=0.8
3.1-2.3=0.8
3.9-3.1=0.8
x-3.9=0.8
x=0.8+3.9=4.7=ans.
3.1-2.3=0.8
3.9-3.1=0.8
x-3.9=0.8
x=0.8+3.9=4.7=ans.
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