question: What approximate value should come in place of question mark (?) in the following equation
287.532 + 1894.029 657.48 = 843.095 + ?
Options:
(A) 870
(B) 790
(C) 680
(D) 770
(E) 890
answer: Stream of consciousness: ? = 285 + 1895 655 845 or, ? = 680 The answer is (C).

q: Find the mean proportional between 25 & 36?
Options:
(A) A) 59
(B) B) 30
(C) C) 63
(D) D) 65
(E) E) 67
a: Stream of consciousness: Formula = ab
A = 25 and B = 36
2536 = 5 6 = 30 The answer is (B).

question: A train running at the speed of 60 km/hr crosses a pole in 6 sec. What is the length of the train?
Options:
(A) 118
(B) 150
(C) 277
(D) 258
(E) 100
answer: Stream of consciousness: Speed = 60 * 5/18 = 50/3 m/sec
Length of the train = speed * time = 50/3 * 6 = 100 m The answer is (E).

q: How much is 80% of 40 is greater than 4/5 of 15?
Options:
(A) 12
(B) 20
(C) 18
(D) 12
(E) 81
a: Stream of consciousness: (80/100) * 40 (4/5) * 15
32 - 12 = 20 The answer is (B).

question: The average age of a class of 40 students is 15 yrs. if the teacher's age is also included, the average increases by one year. Find the age of the teacher
Options:
(A) 30 Years
(B) 56 Years
(C) 32 Years
(D) 34 Years
(E) 49 Years
answer: Stream of consciousness: Total age of students is 40X15 = 600 Years
Total age inclusive of teacher = 41X (15+1) = 656
So, Teacher's age is 656-600 = 56 Yrs
There is a shortcut for these type of problems
Teacher's age is 15+(41X1) = 56 Years The answer is (B).

question: 3 friends A, B, C went for week end party to McDonald's restaurant and there they measure there weights in some order In 7 rounds. A, B, C, AB, BC, AC, ABC. Final round measure is 140kg then find the average weight of all the 7 rounds?
Options:
(A) 98.5 kgs
(B) 80 kgs
(C) 76.5 kgs
(D) 67.5 kgs
(E) 58.2 kgs
answer:
Stream of consciousness: Average weight = [(a + b + c + (a+b) + (b+c) + (c+a)+(a+b+c)] / 7 = 4 (a+b+c) /7 = 4 x 140/7 = 80 kgs The answer is (B).