Dear frnds i am starting this thread for all sorts of questions which can help us develop our logic with time ....
Please share your questions with us

Please keep the "Numbers" of questions and answers distinct so as to avoid any confusion


Question 1 A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is he pointing at?

Question 2 How few times can you weigh 9 identical cookies on a balance scale to find the one with a gold ring inside?

Question 3 On my way to the fair, I met 7 jugglers and a bear, every juggler had 6 cats, every cat had 5 rats, every rat had 4 houses, every house had 3 mouses, every mouse had 2 louses, every louse had a spouse. How many in all are going to the fair?


Answers will be posted soon

Try this

Question 4 A light-tight wooden box has three switches on the outside that control three light bulbs on the inside. When the box is closed you can turn the switches on or off but when you open the box how can you tell which switch controls each bulb without touching the switches?


Answer : Will be posted tomorrow

Dear frnds i am starting this thread for all sorts of questions which can help us develop our logic with time ....
Please share your questions with us

Please keep the "Numbers" of questions and answers distinct so as to avoid any confusion


Question 1 A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is he pointing at?

Question 2 How few times can you weigh 9 identical cookies on a balance scale to find the one with a gold ring inside?

Question 3 On my way to the fair, I met 7 jugglers and a bear, every juggler had 6 cats, every cat had 5 rats, every rat had 4 houses, every house had 3 mouses, every mouse had 2 louses, every louse had a spouse. How many in all are going to the fair?


Answers will be posted soon


Ans

1 My fathers son must mean himself because he has no brothers, and since this is the father of the person he is pointing at, he is pointing at his son

2 Two , put 3 cookies in each side.. choose the 3 heaviest .. if they balance choose the remaining 3 ... then put 2 of the chosen cookies on balance.. the 3rd is the heaviest of they balance

3 Just me ... the other were coming from the fair

---------- Post added at 10:59 PM ---------- Previous post was at 10:57 PM ----------

Try this

Question 4 A light-tight wooden box has three switches on the outside that control three light bulbs on the inside. When the box is closed you can turn the switches on or off but when you open the box how can you tell which switch controls each bulb without touching the switches?


Answer : Will be posted tomorrow

Turn one switch on for 5 minutes... then turn it off and turn on the another switch before u open the box... one buil will be lit ... one will be warm and the unswictched one cool

Question 5 What letter is next in this sequence?

O, T, T, F, F, S, S, E, __

Question 6 Eskimos are very good hunters, but they never hunt penguins. Why not?

Ans 5 -- N for Nine

Ans 6 -- Eskimos live at North Pole, Penguins at south pole

---------- Post added at 11:32 AM ---------- Previous post was at 10:48 AM ----------

Try Probability

Question 7 A number is selected at random from first thirty natural numbers. What is the chance that it is a multiple of either 3 or 13?

a) 17/30
b) 2/5
c) 11/30
d) 4/15

Question 8 An anti aircraft gun can fire four shots at a time. If the probabilities of the first, second, third and the last shot hitting the enemy aircraft are 0.7, 0.6, 0.5 and 0.4, what is the probability that four shots aimed at an enemy aircraft will bring the aircraft down?

a) 0.84
b) .916
c) .036
d) .964

Question 9 When 4 dice are thrown, what is the probability that the same number appears on each of them?

a) 1/36
b) 1/18
c) 1/216
d) 1/5

Answer 7
The probability that the number is a multiple of 3 is 10/30.

Similarly the probability that the number is a multiple of 13 is 2/30.

Neither 3 nor 13 has common multiple from 1 to 30. Hence these events are mutually exclusive events. Therefore chance that the selected number is a multiple of 3 or 13 is (10+2)/30 = 2/5


will try the other 2 later ;)

---------- Post added at 05:42 PM ---------- Previous post was at 04:22 PM ----------

Haven't been able to solve question 8 yet :Frustration:

Answer 9 When 4 dice are thrown simultaneously... the total number of possible outcomes is 6^4 = 1296

The chances that all the dice show same number (1,1,1,1), (2,2,2,2), (3,3,3,3), (4,4,4,4), (5,5,5,5), (6,6,6,6)} ------ 6 ;)

Probability = Event/ Sample space = 6/1296 = 1/216
:banana



Help me with the 8th question

Solution to question 8
The enemy aircraft will be brought down even if one of the four shots hits the aircraft.

The opposite of this situation is that none of the four shots hit the aircraft.

The probability that none of the four shots hit the aircraft is given by (1-0.7)(1-0.6)(1-0.5)(1-0.4) = 0.3*0.4*0.5*0.6 = 0.036

So, the probability that at least one of the four hits the aircraft = 1 – 0.036 = 0.964

Question 10 A rectangular garden has an area of 2000 m^2 and its length and breadth are in the ratio 5:4. A road of uniform width runs inside the garden around the perimeter and has an area of 344 m^2. The width of the road is

a) 3m
b) 3.5m
c) 4m
d) 2m

Question 11 Three Integers are chosen at random without replacement from the first 20 positive integers. The probability that their product is even is

a)2/19
b)17/19
c)3/17
d)15/17

Question 12 Find the number of positive integral solutions for the equation 7x + 3y =123, such that x is always less than y

a) 5
b) 6
c) 3
d) 4

Question 13 Find the greatest number of five digits, which is exactly divisible by 7, 10, 15, 21 and 28.

(1) 99840
(2) 99900
(3) 99960
(4) 99990

Question 14 When a number is divided by 36, it leaves a remainder of 19. What will be the remainder when the number is divided by 12?

(1) 10
(2) 7
(3) 192
(4) None of these

QUESTION 15

Which of the following is incorrect?
(1) An incentre is a point where the angle bisectors meet.
(2) The median of any side of a triangle bisects the side at right angle.
(3) The point at which the three altitudes of a triangle meet is the orthocentre.
(4) The point at which the three perpendicular bisectors meet is the centre of the circumcircle.

Ans - (2)

QUESTION 16

What is the area of the largest triangle that can be fitted into a rectangle of length 'l' units and width 'w' units?
(1) lw/3 (2) (2lw)/3 (3) (3lw)/4 (4) (lw)/2

Ans - (4)

QUESTION 17

Find the number of triangles in an octagon.

(1) 326 (2) 120
(3) 56 (4) Cannot be determined

Ans - (3)

QUESTION 18

The time in a clock is 20 minute past 2. Find the angle between the hands of the clock.
(1) 60 degrees
(2) 120 degrees
(3) 45 degrees
(4) 50 degrees

Ans - (4)

QUESTION 19

Given that on 27th February 2003 is Thursday. What was the day on 27th February 1603?
(1) Monday
(2) Thursday
(3) Sunday
(4) Tuesday

Ans - (2)

QUESTION 20

How often between 11 O'clock and 12 O'clock are the hands of the clock together at an integral number value?
(1) 55
(2) 56
(3) 4
(4) 5

Ans - (4)

Hello,

A brain teaser is a form of puzzle that involves cogitating or mental/cognitive activity to solve. Normally, this includes thinking in unconventional ways with given constraints in mind; sometimes, it also involves lateral thinking. Logic puzzles and riddles are specific types of brain teasers.

Thanks,

It's Great Idea.

Solve this one:

Haretown and Tortoiseville are 40 miles apart. A hare travels at 9 miles per hour from Haretown to Tortoiseville, while a tortoise travels at 1 miles per hour from Tortoiseville to Haretown.

If both set out at the same time, how many miles will the hare have to travel before meeting the tortoise en route?