# Aptitude - Logarithm - Discussion

### Discussion :: Logarithm - General Questions (Q.No.4)

4.

If log 27 = 1.431, then the value of log 9 is:

 [A]. 0.934 [B]. 0.945 [C]. 0.954 [D]. 0.958

Explanation:

log 27 = 1.431 log (33 ) = 1.431 3 log 3 = 1.431 log 3 = 0.477 log 9 = log(32 ) = 2 log 3 = (2 x 0.477) = 0.954.

 Arvind said: (Jan 19, 2012) How come log3 value .477

 Olamikan Adesanmi said: (Apr 11, 2012) You divide 1. 431 by 3, making log3 subject of formula you get log 3 = 0.477

 Subham Singh Rathore said: (Nov 11, 2012) log27=1.431 log3^3=1.431 3log3=1.431 log3=1.431/3 log3=0.477 log9=log3^2 then 2log3 2*0.477 = 0.954

 Hanumanth said: (Dec 15, 2012) log27=1.431 log3^3=1.431 3log3=1.431 log3=1.431/3 log3=0.477 log(9*3)=1.431 log9+log3=1.431 log9=1.431-0.477 log9=0.954

 Jilpy said: (Jun 5, 2014) @Arvind. Here, 3* log3 = 1.431. Then, 1.431/3 = 0.477.

 Mr. Bean said: (Sep 29, 2014) log27 = log(3*9) = log3+log9. So, log9 = log27-log3. log9 = 1.4310-0.4771. log9 = 0.9539 ~ 0.954.

 Maria said: (Dec 2, 2014) Please tell me how we can divide the value with the point I don't know how to divide with a point value like 3.

 Pranjit said: (Feb 17, 2015) Its given 1.431 i.e the point is at before three number. Hence we can write: = 1431/1000. Now its divide by 3. = 1431/3-1000. i.e 477/1000 = 0.477. Because the numbers of zero three hence the point comes in before three number.

 Princi said: (Feb 15, 2016) These are very easy steps, use your mind.

 Jay Vishwakarma said: (Jun 2, 2016) How to draw the graphs of log functions? Can anyone tell me?

 Anouska said: (May 29, 2017) Thanks for the solution. It helped a lot.

 Shubhek K.R said: (Sep 15, 2018) How find value of log3 =0.477? Please explain it.