#61 - Logical Clock Problem
Time in a digital clock can be palindromic like 12:12 (same when read forwards or backwards).
Whats the minimum interval between 2 times that are palindromic ?
2 minutes (between 9:59 and 10:01)
#62 - Maths Magic Puzzle
A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...
and the resulting number consist of only one digit.
Can you identify the number ?
12345679
12345679 × 9 = 111111111 (only 1s)
12345679 × 18 = 222222222 (only 2s)
12345679 × 27 = 333333333 (only 3s)
12345679 × 36 = 444444444 (only 4s)
12345679 × 45 = 555555555 (only 5s)
#63 - What Is Time Riddle
I noticed that on my big wall clock, there is a time when the minute and hour clock are exactly between one and two.
Also, I notice both hands lie on top of each other.
What is the time I am talking about?
12:00
both minute and hour clock lie exactly between the number one and two in the number.
#64 - Infogain Interview Aptitude Question
On a magical land of Narnia , all the animal in the land are rational.
There are 10 tigers and one goat.
Tiger can eat goat but since its a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).
If we leave them for some time then how many goat and tiger will be there , when we come back ?
9 tiger and one goat
since all animal are rational , once 1st tiger eats the sheep all the rest of tiger would know about this.
#65 - Oracle Probability Interview Question
What is the probability of choosing the correct answer at random from the options below.
a) 1/4
b) 1/2
c) 1
d) 1/4
If the answer is 1/4, then because 2 out of 4 answer choices are '1/4', the answer must actually be 1/2. This is a contradiction. So the answer cannot be 1/4.
If the answer is 1/2 (or 1), then because 1/2 (or 1) is 1 out of 4 answer choices, the answer must be 1/4. This is again a contradiction. So the answer cannot be 1/2 (nor 1).
So none of the provided answer choices are correct. Therefore the probability of choosing the correct answer is 0%
#66 - Logical Thinking Riddle
I have 100 coins in my wallet.
What is the minimum number of coin(s), i would be required in order to make sure each coin touched exactly three other coins.
4
3 placed flat on the table in a triangle(touching each other) and put the fourth one on top of them in the middle.
#67 - Maths Logic Riddle
It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten-digit numbers.
But I also know how many of these numbers are prime.
Do you?
Zero
The sum of numbers from zero to nine is 45 and can be divisible by 3 and 9.
#69 - Hard Logic Chess Puzzle
Assume you have the white pieces, can you win in a half a move ?
White should grab the rook from a1, place it at d1 and complete the castling move.
#70 - Tricky Math Problem
1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent
=> 1 dollar = 1 cent
solve this tricky problem ?
step 3 is wrong