question: The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?
Options:
(A) 9
(B) 8
(C) 7
(D) 6
(E) 5
answer: Stream of consciousness: 1 to 9 = 9 * 9 = 81
1 to 5 = 5 * 10 = 50
5 to 9 = 5 * 8 = 40
5th = 50 + 40 = 90 81 = 9 The answer is (A).

q: What should come in place of the question mark (?) in the following equation?
90000 + 5010 = 87050 + ?
Options:
(A) 7960
(B) 7554
(C) 8465
(D) 4578
(E) 4689
a: Stream of consciousness: 90000 + 5010 = 87050 + ?
90000 + 5010 87050 = 7960 The answer is (A).

question: Find the product of the local value and absolute value of 4 in 20468?
Options:
(A) 1000
(B) 1100
(C) 1200
(D) 1340
(E) 1600
answer: Stream of consciousness: Local value of 4 = 4 x 100 = 400
Place value of 4 = 4
There fore = 4 x 400 = 1600 The answer is (E).

q: The average of first 10 odd numbers is?
Options:
(A) 11
(B) 10
(C) 19
(D) 16
(E) 13
a: Stream of consciousness: Sum of 10 odd no. = 100
Average = 100/10 = 10 The answer is (B).

question: A no. when divided by the sum of 555 and 445 gives 2times their difference as quotient & 40 as remainder. Find the no. is?
Options:
(A) 220044
(B) 145778
(C) 220400
(D) 220014
(E) 220040
answer: Stream of consciousness: (555 + 445) * 2 * 110 + 30 = 220000 + 30 = 220040 The answer is (E).

question: How much more would Rs.20000 fetch, after two years, if it is put at 20% p.a. compound interest payable half yearly than if is put at 20% p.a. compound interest payable yearly?
Options:
(A) Rs.482
(B) Rs.424
(C) Rs.842
(D) Rs.512
(E) Rs.524
answer:
Stream of consciousness: 20000(11/10)4 - 20000(6/5)2 = 482 The answer is (A).