Civil Engineering - UPSC Civil Service Exam Questions - Discussion

36. 

Following data refer to precise measurement of an angle A on the field :
(i) 2A = 20°10' - weight 2
(ii) 4A = 40°10' - weight 3
What is the most probable value of angle A ?

[A]. 10°01'06"
[B]. 10°02'07"
[C]. 10°02'51"
[D]. 10°22'51"

Answer: Option C

Explanation:

No answer description available for this question.

Monika Verma said: (Sep 3, 2019)  
Can anyone explain?

Jack said: (Apr 12, 2020)  
Someone, please explain.

Chila Chang said: (Mar 4, 2021)  
2A - weight 2
4A - weight 3

Normal equation for A :
I) 2*2*2A = 80°40'0''.
II) 3*4*4A= 482°00'00''.

Adding (I) & (II):
56A = 562°40'.
Therefore,
A= 10°02'51''.

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