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.
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.
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
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...
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.
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.
Hari krishna said:
10 years ago
The logic is, Add 0.8 for each digit.
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.
Subhankar said:
1 decade ago
Compare it carefully & you must find this.
Manthan (JAMLA GJ 9 ) said:
1 decade 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.
Alish said:
1 decade ago
1.5+0.8 = 2.3,
2.3+0.8 = 3.1,
3.1+0.8 = 3.9,
3.9+0.8 = 4.7.
Answer: 4.7.
2.3+0.8 = 3.1,
3.1+0.8 = 3.9,
3.9+0.8 = 4.7.
Answer: 4.7.
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