Aptitude - Surds and Indices - Discussion

Discussion :: Surds and Indices - General Questions (Q.No.6)

6. 

(256)0.16 x (256)0.09 = ?

[A]. 4
[B]. 16
[C]. 64
[D]. 256.25

Answer: Option A

Explanation:

(256)0.16 x (256)0.09 = (256)(0.16 + 0.09)

   = (256)0.25

   = (256)(25/100)

   = (256)(1/4)

   = (44)(1/4)

   = 44(1/4)

   = 41

   = 4


Prasanthi said: (Dec 11, 2014)  
(4^4)^16/100*(14^4)^9/100.

= (4)^16/25*(4)^9/25.
= (4)^25/25.

= 4.

Gil said: (Jan 23, 2016)  
Where did you get number of 100?

Sairam said: (Aug 4, 2016)  
@Gil, 0.25 can be written as 25/100.

Angel said: (Apr 14, 2017)  
Nice explanation @Prasanthi.

Golusingh said: (Oct 18, 2017)  
Very well explained. Thanks.

Gagan Deep Kaur said: (Jan 3, 2018)  
Nice explanation. Thank you all.

Swastika said: (Sep 27, 2018)  
Nice explanation. Thanks.

Afroza said: (Mar 17, 2019)  
Thanks all for your explanation.

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