question: Find the invalid no.from the following series 13, 18, 25, 30, 37, 40
Options:
(A) 23
(B) 35
(C) 40
(D) 45
(E) 67
answer: Stream of consciousness: The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong. The answer is (C).

q: A man invested Rs. 1552 in a stock at 97 to obtain an income of Rs. 128. The dividend from the stock is:
Options:
(A) 8%
(B) 6%
(C) 9%
(D) 10%
(E) 11%
a: Stream of consciousness: Rs 1552 income = Rs 128
By investing Rs 97 income = 128/1552*97 = Rs 8
Divdend = 8% The answer is (A).

question: If the ratio of boys to girls in a class is B and the ratio of girls to boys is G; then 3 (B + G) is ?
Options:
(A) Equal to 3
(B) Less than 3
(C) More than 3
(D) Less than 1/3
(E) none of these
answer: Stream of consciousness: Let number of boys = x
Let number of girls = y
Therefore x/y = B and y/x = G
3(B + G) = 3[(x/y) + (y/x)] = 3[(x2 + y2)/xy] > 3 The answer is (C).

q: A boy runs 200 metres in 30 seconds. What is his speed ?
Options:
(A) 20 km/hr
(B) 24 km/hr
(C) 30 km/hr
(D) 32 km/hr
(E) 34 km/hr
a: Stream of consciousness: 200/30 * 18/5 = 24 km/hr The answer is (B).

question: At what rate percent on simple interest will a sum of money double itself in 30 years?
Options:
(A) 3 1/3%
(B) 3 5/3%
(C) 3 1/9%
(D) 3 1/5%
(E) 3 1/7%
answer: Stream of consciousness: P = (P*30*R)/100
R = 3 1/3% The answer is (A).

question: A train 350 m long, running with a speed of 63 km/hr will pass a tree in?
Options:
(A) 18 sec
(B) 20 sec
(C) 76 sec
(D) 15 sec
(E) 17 sec
answer:
Stream of consciousness: Speed = 63 * 5/18 = 35/2 m/sec
Time taken = 350 * 2/35 = 20 sec The answer is (B).