Q: Dacid obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology. What are his average marks?
Options:
(A) 32
(B) 88
(C) 77
(D) 99
(E) 75
A: OK... Stream of consciousness: Average = (76 + 65 + 82 + 67 + 85)/5 = 375/5 = 75.
The answer is (E).

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: OK... Stream of consciousness: {Total} = {finance} + {marketing} - {both} + {neither}
100 = 25 + 52 - {both} + 40
{both} = 17%.
The answer is (D).

Q: A cricket bat is sold for $850, making a profit of $225. The profit percentage would be
Options:
(A) 24%
(B) 25%
(C) 30%
(D) 36%
(E) 40%
A: OK... Stream of consciousness: 225/(850 - 225) = 225/625 = 9/25 bit more than 33%.
The answer is (D).

Q: The price of a T.V. set worth Rs. 40000 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) 26788
(D) 19000
(E) 39000
A:
OK... Stream of consciousness: Money paid in cash = Rs. 1000
Balance payment = (40000 - 1000) = Rs. 39000
The answer is (E).