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) 75
(B) 45
(C) 23
(D) 28
(E) 96
Answer and stream of consciousness: (A)
Stream of consciousness: Average = (76 + 65 + 82 + 67 + 85)/5 = 375/5 = 75.

How much is 70% of 40 is greater than 4/5 of 25?
Options:
(A) 12
(B) 27
(C) 18
(D) 12
(E) 8
Answer and stream of consciousness: (E)
Stream of consciousness: (70/100) * 40 (4/5) * 25
28- 20 = 8

If the given two numbers are respectively 6% and 30% of a third number, then what percentage is the first of the second ?
Options:
(A) 20%
(B) 25%
(C) 18%
(D) 30%
(E) none of these
Answer and stream of consciousness: (A)
Stream of consciousness: Here, l = 6 and m = 30
Therefore, first number = l/m x 100% of second number = 6/30 x 100% of second number = 20% of second number

Rs. 5600 is divided into three parts A, B and C. How much A is more than C if their ratio is 1/7:1/7:1/14?
Options:
(A) 300
(B) 992
(C) 1120
(D) 552
(E) 312
Answer and stream of consciousness:
(C)
Stream of consciousness: 1/7:1/7:1/14 = 2:2:1
1/5*5600 = 1120
2240-1120 = 1120