average Solved Question
(Aptitude discussion)
 A shopkeeper earned Rs. 504 in 12 days. His average income for the first four days was Rs. 40 a day. His average income for the remaining days is?

 Rs. 40
 Rs. 42
 Rs. 43
 Rs. 45
Correct Option: C
Let the average for remaining 8 days be Rs. y a day.
Then, ( 4 x 40 ) + 8y = 504
⇒ 8y = 344
⇒ y = 43
∴ required average Rs. 43