q: Sarah's grade was 50th percentile of the 20 grades for her class. Of the 30 grades from another class, 10 were higher than Sarah's, and the rest were lower. If no other grade was the same as Sarah's grade, then Sarah's grade was what percentile of the grades of the two classes of two classes combined?
Options:
(A) 52nd
(B) 56th
(C) 60th
(D) 70th
(E) 82nd
a: Stream of consciousness: 52nd/56th/60th/70th/82nd The answer is (C).

question: A train 360 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 120 meters long is?
Options:
(A) 29
(B) 18
(C) 48
(D) 99
(E) 32
answer: Stream of consciousness: D = 360 + 120 = 480
S = 54 * 5/18 = 15 mps
T = 480/15 = 32 sec The answer is (E).

q: Some persons can do a piece of work in 12 days. Two times the number of these people will do half of that work in?
Options:
(A) 3 days
(B) 6 days
(C) 8 days
(D) 4 days
(E) 9 days
a: Stream of consciousness: 12/ (2 * 2) = 3 days The answer is (A).

question: How much 80% of 40 is greater than 10% of 15?
Options:
(A) 18
(B) 99
(C) 19
(D) 18
(E) 17
answer: Stream of consciousness: (80/100) * 40 (10/100) * 15
32 - 15 = 17 The answer is (E).

q: Find the third proportional to 9 and 12?
Options:
(A) 10
(B) 12
(C) 16
(D) 19
(E) 20
a: Stream of consciousness: Formula = Third proportional = (b b)/a
A = 9 and B = 12
(12 12)/ 9 = 144/9 = 16 The answer is (C).

q: If Raj shares all of his amount equally among his five friends then each of his friend's amount increased by $10 then Raj had how much?
Options:
(A) $10
(B) $20
(C) $30
(D) $40
(E) $50
a:
Stream of consciousness: Five friends amount increased by $10 and Raj shared equally so amount = 5 * 10 = 50 The answer is (E).