Reasoning: 31. only the perfect squares between 1 to 1k
Ans: (B)
Question: There are 1000 doors that are of the open-close type. When a person opens the door he closes it and then opens the other. When the first person goes he opens-closes the doors in the multiples of 1 i.e., he opens and closes all the doors. when the second goes he opens and closes the doors 2, 4 6 8 respectively. Similarly when the third one goes he does this for 3 6 9 12 15th doors respectively. Find number of doors that are open at last.
Options:
(A) 29
(B) 31
(C) 32
(D) 24
(E) 21
Rationale: (9+5) +5 = 19
(16+9) +6 = 31
(28+16)+7 = 51
(48+28)+8 = 84
The answer: (A)
Question: 5,9,19,31,51,__
Options:
(A) 84
(B) 80
(C) 81
(D) 82
(E) 83
Reasoning: P(A|B) = P(A âˆª B)/P(B)
P(A|B) = (11/15)/(4/15) = 11/4.
Ans: (A)
Question: If P(A) = 2/15, P(B) = 4/15, and P(A âˆª B) = 11/15 Find P(A|B)
Options:
(A) 11/4
(B) 2/3
(C) 3/2
(D) 4/5
(E) 4/7
Rationale: D = 200 + 150 = 350
S = 36 * 5/18 = 10 mps
T = 350/10 = 35 sec
The answer: (B)
Question: How many seconds will a train 200 meters long take to cross a bridge 150 meters long if the speed of the train is 36 kmph?
Options:
(A) 22 sec
(B) 35 sec
(C) 25 sec
(D) 18 sec
(E) 17 sec
Reasoning: Required persons = 325000−300000/50 = 500
Ans: (E)
Question: N number of persons decide to raise 3 lakhs by equal contributions from each. If they contributed 50 each extra, the contribution would be 3.25 lakhs. How many persons are there?
Options:
(A) 600
(B) 400
(C) 450
(D) Cannot be determined
(E) None of these
Reasoning: 9 = (1*40*R)/100
R = 22 1/2 %
Ans: (D)

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
Question: If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?
Options:
(A) 22 1/8 %
(B) 22 9/2 %
(C) 22 1/7 %
(D) 22 1/2 %
(E) 21 1/2 %