question:The average of seven numbers is 9. The average of first three numbers is 7 and the average of last three numbers is 11. What is the middle number?
Options:
(A) 7
(B) 8
(C) 9
(D) 11
(E) 10
answer:(C)
Stream of consciousness:The total of seven numbers = 7X9 = 63
The total of first 3 and last 3 numbers is = 3 X 7+3 X 11 = 54
So, the middle number is (63 - 54 ) = 9

question:If rupee one produces rupees nine over a period of 42 years, find the rate of simple interest?
Options:
(A) 22 1/7 %
(B) 22 3/2 %
(C) 21 3/7 %
(D) 22 1/2 %
(E) 22 1/2 %
answer:(C)
Stream of consciousness:9 = (1*42*R)/100
R = 21 3/7 %

question:If Raj shares all of his amount equally among his five friends then each of his friend's amount increased by $10 then Raj had how much?
Options:
(A) $10
(B) $20
(C) $30
(D) $40
(E) $50
answer:
(E)
Stream of consciousness:Five friends amount increased by $10 and Raj shared equally so amount = 5 * 10 = 50