q: In a school of 850 boys, 44% of Muslims, 14% Hindus, 10% Sikhs and the remaining of other communities. How many belonged to the other communities?
Options:
(A) A) 125
(B) B) 627
(C) C) 153
(D) D) 721
(E) E) 272
a: Stream of consciousness: 44 + 14 + 10 = 68%
100 68 = 32%
850 * 32/100 = 272 The answer is (E).

question: A and B can together complete a piece of work in 4 days. If A can alone can complete the same work in 12 days, in how many days can B alone complete that work?
Options:
(A) 6
(B) 5
(C) 4
(D) 3
(E) 2
answer: Stream of consciousness: (A+B)'s 1 day work = 1/4
A's 1 day work = 1/12
B's 1 day work = 1/6 The answer is (A).

q: Simple interest on a certain sum is 16 over 25 of the sum. Find the rate per cent and time, if both are equal.
Options:
(A) 8% and 8 years
(B) 6% and 6 years
(C) 10% and 10 years
(D) 12 % and 12 years
(E) None of these
a: Stream of consciousness: 1625P = PRR/100
R2 = 160025 R = 405 = 8%
Also, time = 8 years The answer is (A).

question: How much is 55% of 40 is greater than 4/5 of 25?
Options:
(A) 29
(B) 776
(C) 2
(D) 12
(E) 99
answer: Stream of consciousness: (55/100) * 40 (4/5) * 25
22 - 20 = 2 The answer is (C).

q: Walking across campus, a student interviewed a group of students. 25% of the students took a finance class last semester, 52% took a marketing class last semester, and 40% took neither a finance nor a marketing class last semester. What percent of the students in the group took both a finance and a marketing class?
Options:
(A) 60%
(B) 50%
(C) 25%
(D) 17%
(E) 10%
a: Stream of consciousness: {Total} = {finance} + {marketing} - {both} + {neither}
100 = 25 + 52 - {both} + 40
{both} = 17%. The answer is (D).

q: The average age of a class of 39 students is 15 years. If the age of the teacher be included, then the average increases by 3 months .Find the age of the teacher.
Options:
(A) 22
(B) 25
(C) 8
(D) 27
(E) 19
a:
Stream of consciousness: Sum of the ages of the students = 3915 = 585
New average = 15 years 3 months = 15 + 1414 year
Sum of the ages of students and teacher = 4015141514 = 40614614 = 610
Teacher age = 610 585 = 25 years. The answer is (B).