Aptitude - Logarithm - Discussion

Discussion :: Logarithm - General Questions (Q.No.8)

8. 

If log10 2 = 0.3010, the value of log10 80 is:

[A]. 1.6020
[B]. 1.9030
[C]. 3.9030
[D]. None of these

Answer: Option B

Explanation:

log10 80 = log10 (8 x 10)
= log10 8 + log10 10
= log10 (23 ) + 1
= 3 log10 2 + 1
= (3 x 0.3010) + 1
= 1.9030.

Mahesh said: (Feb 8, 2012)  
Why take (8*10) in step 1st?

Gayathri said: (Nov 3, 2013)  
log10 80 = log10 (8*10)

Because in question they are give log10 2 value for that we split this 80 and we can able to write 8 in terms of power 2 that's why it is split.

Mehdi said: (Sep 13, 2015)  
Why we take (8*10) in first step describe me in detail?

Dheeraj said: (Jul 22, 2017)  
Log10^80=80log10.
Now log10^2=2log10=0.3010.
Log10=0.1505.
Put the value,
80*0.1505=12.040.

Jasmitha said: (Sep 4, 2017)  
@Mahesh.

Just because 10*8=80 so we are splitting.

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