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41) the answer is C)11  
(totalmark=63n,totalmark+22=65n,65n-63n=22,n=11, where n is the no. of subjects)
43) the answer is  c) 441  (√x=21)
45) the answer is B) 70 (it is 69.89 app.)
49) the answer is C)1024  (420+604)
50) the answer is B)1/4

1 3 1
ANS OF 43] 441[x=441]
1 2 1
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