question:If the average (arithmetic mean) of the four numbers K, 2K + 3, 3K 5 and 5K + 1 is 118, what is the value of K?
Options:
(A) 11
(B) 15 3/4
(C) 22
(D) 118
(E) 25 3/10
answer:(D)
Stream of consciousness:K + 2K +3 + 3K - 5 + 5K +1 = 11K -1
(11K -1)/4 = 118
11K = 118 * 4 +1 = 472 +1 = 473
K = 473 / 11 = 43.

question:The inverse ratio of 3: 2: 1 is?
Options:
(A) 2:9:5
(B) 2:3:0
(C) 2:3:5
(D) 2:3:6
(E) 2:3:1
answer:(D)
Stream of consciousness:1/3: 1/2: 1/1 = 2:3:6

question:The price of a T.V. set worth Rs. 30000 is to be paid in 20 installments of Rs. 1000 each. If the rate of interest be 6% per annum, and the first installment be paid at the time of purchase, then the value of the last installment covering the interest as well will be?
Options:
(A) 22678
(B) 26699
(C) 29000
(D) 19000
(E) 26711
answer:
(C)
Stream of consciousness:Money paid in cash = Rs. 1000
Balance payment = (30000 - 1000) = Rs. 29000