question: The average of first six prime numbers greater than 3 is?
Options:
(A) 16
(B) 10
(C) 12
(D) 19
(E) 17.8
answer: Stream of consciousness: 5 + 7 +11 + 13 + 17 + 19 = 72/6 = 12 The answer is (C).


q: A train 120 meters long completely crosses a 480 meters long bridge in 55 seconds. What is the speed of the train is?
Options:
(A) 32
(B) 545
(C) 39
(D) 40
(E) 09
a: Stream of consciousness: S = (120 + 480)/45 = 600/55 * 18/5 = 39 The answer is (C).


question: Ravi can do a piece of work in 11 days while Prakash can do it in 22 days. In how many days will they finish it together?
Options:
(A) 5 7/3 days
(B) 7 1/3days
(C) 5 1/9 days
(D) 5 7/3 days
(E) 4 7/9 days
answer: Stream of consciousness: 1/11 + 1/22 = 3/22
22/3 = 7 1/3 days The answer is (B).


q: The price of a T.V. set worth Rs. 8000 is to be paid in 20 installments of Rs. 750 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) 7250
(B) 7200
(C) 7820
(D) 6000
(E) 2799
a: Stream of consciousness: Money paid in cash = Rs. 750
Balance payment = (8000- 1000) = Rs. 7250 The answer is (A).


question: A train 280 m long, running with a speed of 63 km/hr will pass a tree in?
Options:
(A) 15 sec
(B) 16 sec
(C) 18 sec
(D) 20 sec
(E) 25 sec
answer: Stream of consciousness: Speed = 63 * 5/18 = 35/2 m/sec
Time taken = 280 * 2/35 = 16 sec The answer is (B).


question: From the set of numbers x, y, t, z, p, q, r and w, how many different combinations can we have without the t,p,q and r in them? Ex:. (x,y), (x), (w,z,y,x), etc and (x,y)=(y,x)
Options:
(A) 10
(B) 12
(C) 15
(D) 16
(E) 30
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Stream of consciousness: Another way: Any letter (x, y, z, w) can be included or not. So, we have 2^4 combinations - 4 empty combination = 12 combinations The answer is (B).