### Discussion :: Number Series - Type 1 (Q.No.11)

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

Prathyusha said: (Feb 22, 2011) | |

1.5+0.8=2.3 3.1+0.8=3.9 3.9+0.8=4.7 4.7 is answer |

Krishna said: (Sep 25, 2011) | |

1.5+1.6=3.1 3.1+1.6=4.7 |

Navya said: (Sep 27, 2011) | |

2.3-1.5=0.8 3.1-2.3=0.8 3.9-3.1=0.8 4.7-3.9=0.8 |

Ram said: (Oct 20, 2011) | |

2.3-1.5=0.8 3.1-2.3=0.8 3.9-3.1=0.8 4.7-3.9=0.8 |

Manish said: (Nov 22, 2011) | |

2.3-1.5=0.8 3.1-2.3=0.8 3.9-3.1=0.8 4.7-3.9=0.8 |

Raji said: (Jan 31, 2012) | |

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. |

Varun said: (Sep 7, 2012) | |

We can make chain also. It is direct method. 3.1-1.5=1.6 3.1+1.6=4.7 |

Anu said: (Feb 26, 2013) | |

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... |

Kartik Ahuja said: (May 9, 2014) | |

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. |

Pawan Sharma said: (May 27, 2014) | |

1.5+0.8 = 2.3. 3.1+0.8 = 3.9. 3.9+0.8 = 4.7. |

Prasanth said: (Jun 19, 2014) | |

Compare to all the answers ANU explanation is super and clear that can able to understand the dull students also. |

Priyanka said: (Dec 30, 2014) | |

2.3-1.5 = 0.8. 2.3+0.8 = 3.1. 3.1+0.8 = 3.9. 3.9+0.8 = 4.7. |

Subhankar said: (Sep 30, 2015) | |

Compare it carefully & you must find this. |

Sandeep said: (Oct 6, 2015) | |

2.3-1.5 = 0.8. 2.3+0.8 = 3.1. 3.1+0.8 = 3.9. 3.9+0.8 = 4.7. |

Manthan (Jamla Gj 9 ) said: (Nov 4, 2015) | |

15, 23, 31, 39, ? 31-15 = 16. 39-23 = 16. So 31+16 = 47. |

Alish said: (Jan 19, 2016) | |

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. |

Roshan Roy said: (Mar 8, 2016) | |

In this simple addition series, each number increases by 0.8. |

Roshan Roy said: (Mar 9, 2016) | |

The formula is +0.8 to the number in the question to get the sum : 1.5+0.8 = 2.3, 2.3+0.8 = 3.1, 3.1+0.8 = 3.9, 3.9+0.8 = 4.7. Therefore the answer is 4.7. |

Anusha said: (Apr 9, 2016) | |

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 So answer is C. |

Veerendra Devadiga said: (Apr 9, 2016) | |

1.5 + 0.8 = 2.3. 2.3 + 0.8 = 3.1. 3.1 + 0.8 = 3.9. 3.9 + 0.8 = 4.7. 1.5, 2.3, 3.1, 3.9, 4.7. |

Vinay said: (May 28, 2016) | |

Yes, the answer is 4.7. Thank you all. |

Vishalsaini said: (Jun 14, 2016) | |

It's a good step for students and very helpful. |

Urvam said: (Jul 13, 2016) | |

We can also solve this question in such a way: As in all terms, 1 is added to LHS digit and 2 is subtracted in RHS digit. 1 + 1 = 2 & 5 - 2 = 3 = 23. As well as. 2 + 1 = 3 & 3 - 2 = 1 = 31. |

M.Raghuram Pgdm 1 said: (Aug 24, 2016) | |

Add by .8 so the answer is 4.7. |

Hari Krishna said: (Oct 12, 2016) | |

The logic is, Add 0.8 for each digit. |

Jeya said: (Dec 13, 2016) | |

1.5 + 0.8 = 2.3. 3.1 + 0.8 = 3.9. 3.9 + 0.8 = 4.7. |

Dinesh said: (Feb 21, 2017) | |

How 0.8 came? Tell me the correct explanation. |

Amit Soni said: (Apr 27, 2017) | |

how 0.8 Came? Please tell me, I wanted to know about this. |

Jagannath Rout said: (May 16, 2017) | |

2.3-1.5 = 0.8 3.1-2.3 = 0.8 3.9-3.1 = 0.8 (Just tell me about how acquire 4.7 this solution ) just addition 3.9+0.8 = 4.7 4.7-3.9 = 0.8. |

Sruthi said: (May 22, 2017) | |

It's a simple A.P with common difference .8. So just add .8 to 3.9. You get the answer 4.7. |

Thameem Ansari said: (Nov 28, 2017) | |

1.5+.8=2.3 2.3+.8=3.1 3.1+.8=3.9 3.9+.8=4.7 the difference is only no.8.so we can add 8 to the previous number. |

Vishal Mittal said: (Jan 25, 2018) | |

1.5, 2.3, 3.1, 3.9,.... Multiply this number by 10 15 23 31 39 .... Take their difference which is 8 Then 39+8=47 Now divide it by 10 which gives answer 4.7. |

Umesh Shettigar said: (May 8, 2018) | |

2.3-1.5 = 0.8. 3.1-2.3 = 0.8. 3.9-3.1 = 0.8. 4.7-3.9 = 0.8. |

Yogeeta said: (Jun 21, 2018) | |

2.3-1.5 = 0.8. 3.1-2.3 = 0.8. 3.9-3.1 = 0.8. 4.7-3.9 = 0.8. |

Manjariu said: (Nov 17, 2018) | |

1.5 + 0.8 = 2.3, 2.3 + 0.8 = 3.1, 3.1 + 0.8 = 3.9, 3.9 + 0.8 = 4.7. |

Vicky Kumar Sharma said: (Mar 20, 2019) | |

1.5 + 0.8 = 2.3, 2.3 + 0.8 = 3.1, 3.1 + 0.8 = 3.9, 3.9 + 0.8 = 4.7. |

Mansi Sharma said: (May 20, 2019) | |

In this series, it is increases by 0.8. |

Foram said: (Aug 16, 2019) | |

Assume that there is no (.) in the series, 15 , 23 , 31 , 39 +8 +8 +8 Add 8 in the next numbers, So, adding +8 in the 39 the answer will be 47. And finally, the answer is 4.7. |

Bitra Gopinath said: (Nov 26, 2019) | |

1.5, 2.3, 3.1, 3.9,.... Multiply this number by 10 15 23 31 39 .... Take their difference which is 8. Then 39+8 = 47. Now divide it by 10 which gives answer 4.7. |

#### Post your comments here:

Name *:

Email : (optional)

» Your comments will be displayed only after manual approval.