q: The floor of a rectangular room is 20 m long and 12 m wide. The room is surrounded by a veranda of width 2 m on all its sides. The area of the veranda is :
Options:
(A) 144 m2
(B) 120 m2
(C) 108 m2
(D) 158 m2
(E) None of these
a: Stream of consciousness: Area of the outer rectangle = 24 16 = 384 m2
Area of the inner rectangle = 20 12 = 240 m2
Required area = (304 180) = 144 m2 The answer is (A).

question: A person spends 1/3rd of the money with him on clothes, 1/5th of the remaining on food and 1/4th of the remaining on travel. Now, he is left with Rs 400. How much did he have with him in the beginning?
Options:
(A) s 200
(B) s 1000
(C) s 300
(D) s 450
(E) s 550
answer: Stream of consciousness: Suppose the amount in the beginning was Rs 'x'
Money spent on clothes = Rs 1x/3 Balance = Rs 2x/3
Money spent on food = 1/5 of 2x/3 = Rs 2x/15
Balance = 2x/3 - 2x/15 = Rs 8x/15
Money spent on travel = 1/4 of 8x/15 = Rs 2x/15 = 8x/15 - 2x/15 = 6x/15 = Rs2x/5
Therefore 2x/5 = 400 = 1000 The answer is (B).

q: A train travels m miles in n hours. How many miles will it travel in x hours at the same rate?
Options:
(A) mnx
(B) mn
(C) mxn
(D) mx
(E) mnx
a: Stream of consciousness: Given Speed = m/n
To Find distance in x hours with same speed
Distance = speed * time
Distance = m/n*x = mx/n The answer is (C).

question: How many prime numbers between 1 and 100 are factors of 7150?
Options:
(A) 238
(B) 100
(C) 299
(D) 270
(E) 111
answer: Stream of consciousness: Ans: 7, 150 = 2521113
So there are 4 distinct prime numbers that are below 100 The answer is (B).

q: If we need to change the average age of a group containing 4 persons from 40 to 38 by adding a person. What should be the age of the person newly added to the group?
Options:
(A) 20
(B) 25
(C) 30
(D) 38
(E) 40
a: Stream of consciousness: Sum of the ages of the group having 4 persons and average 40 = 4x40 = 160
Sum of the ages of the group having 5 persons and average 38 = 5x38 = 190
Age of the new person added to the group = 190-160 = 30 The answer is (C).

q: There are 15 balls in a jar. You take out 3 blue balls without putting them back inside, and now the probability of pulling out a blue ball is 1/3. How many blue balls were there in the beginning?
Options:
(A) 12.
(B) 9.
(C) 8.
(D) 7.
(E) 6.
a:
Stream of consciousness: 7 = 3 blue balls + 12 / 3 The answer is (D).