Mean temperature of a city for a week is $$28^\circ$$C. If the mean temperature for Monday, Tuesday, Wednesday and Thursday is $$27.5^\circ$$C and the mean temperature for Thursday, Friday, Saturday and Sunday is $$29^\circ$$C, the temperature recorded for Thursday is

Given,
Mean temperature of a week = $$ 28^{0} $$ i.e Total temperature 28 x 7 = 196
Mean temperature for Monday, Tuesday, Wednesday and Thursday is $$ 27.5^{0}$$ i.e total temperature = 27.5 x 4 = 110 and 
The mean temperature for Thursday, Friday, Saturday and Sunday is $$ 29^{0}$$ i.e total temperature = 29 x 4 = 116
Now, the temperature recorded for Thursday is,
(110 + 116) - 196 = 226 - 196 = 30
Hence, option A is the correct answer.