Elitmus Exam Numerical Ability Data Interpretation

please answer me of that ques... like starting for 1.. no divided by 7 is 20.. i didnt remember... bt ques is like .. in an exam subject is assigned according to roll no.

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Elitmus Other Question

n^i/2=41

a)83 b)81 c)2 d)1
quant- 95
resoning- 81
verbal- 15
do i get calls??