A Problem of Ping Pong
There are 150 members in my club. We decided to have a ping pong tournament. All the members came forward to play in the game. Every time a member loses a game he is out of the tournament.
There are no ties.
Popularity: 1%
A Problem of Water Lillies
In India water lilies grow extremely rapidly in the ponds. If the growth enlarged so much that each day it covered a surface double that which it filled the day before, so that at the end of the 20th day if entirely covered the pond, in which it grew, how long would it take two water lilies of the same size at the outset and at the same rate of growth to cover the same pond?
Popularity: 1%
No Change!
I got out of the taxi and I was paying the fare. But the taxi driver could not give me change for the rupee note. To my surprise I noticed my two friends. Asha and Neesha walking towards me. I requested them to give me exact change for my rupee note. They search their handbags and said ‘No’.
They both had exactly Re 1.19 each in their handbags. But the denominations were such that they could not give the exact change for a rupee.
Popularity: 1%
Stolen Mangoes
Three naughty boys stole some mangoes from a garden. As it was late in the evening, they decided to divide the fruit equally among them in the morning, and went to sleep.
At night while the other two were sleeping, one boy woke up, tip-toed to the basket of mangoes, counted them and ate one. From the remainder he took a precise third and went back to sleep.
After some time a second boy woke up. He counted the mangoes, at one, took an exact third of the remaining and went back to sleep.
A little before sun rise the third boy also woke up, ate one, and like the other two boys took a precise third of the remainder in whole mangoes.
In the morning, all the three boys went together to the basket of mangoes, counted them. Amongst them they found one which was over ripe—almost
Popularity: 2%
A Problem of Family Relations
Every man or woman alive today had 2 parents, 4 grand-parents, 8 great-grand parents, 16 great-great-grand parents, 32 great, great, great grand parents and so on.
Let us take the case of Ram. Two generations ago Ran had 2 x 2 or 22, or 4 ancestors. Three generations age he had 2 x 2 x 2 or 23or 8 ancestors. For generations ago he had 2 x 2 x 2 x 2 or 24 or 16 ancestors.
Popularity: 1%
Selling Eggs
The egg vendor calls on his first customer and sells half his eggs and half an egg. To the second customer he sells half of what he had left and half an egg, and to the third customer he sells half of what he had then left and half an egg. By the way he did not break any eggs. In the end three eggs were remaining.
Popularity: 1%
Bingo!
A group of us were playing Bingo. I noticed something very interesting. There were different Bingo cards with no two cards having the same set of numbers in corresponding column or row. The centre of course was free space.
Popularity: 1%
Wrong Names of Months
It was in Vienna that I met Prof. Jellinek. He was a linguist. We were discussing calendars for some time – Gregorian calendar, Julian calendar, Hindu calendar, Chinese calendar etc. Then suddenly he popped this question at me.
‘Don’t you think it is strange. December is the twelfth month of year. And do you know what word meaning ten. Therefore, decalitre would mean ten litres and decade means ten years. December then should be tenth month. But it isn’t. How do you explain it?
What do you think my answer was?
Popularity: 1%
A Question of Age
Last winter I was in the United Kingdom. Travelling by the train from London to Manchester, I had for company two middle-aged Englishmen who were seated opposite to me. Naturally, they did not speak to me – because we hadn’t been introduced. But I could not help overhearing their conversation.
‘How old is Tracy, I wonder?’ one asked the other. ‘Tracy!’ the other replied ‘Let me see – eighteen years ago he was three times as old as his son.’
‘But now, it appears, he is only twice as old as his son’ said the former.
Popularity: 1%
Fast Multiplication by 5
This fast calculation trick or vedic maths trick will teach you how to multiply any number by 5. The concept can be divided in two parts as shown-
MULTIPLYING 5 TIMES AN EVEN NUMBER
Memory Trick: Halve the number you are multiplying by and place a zero after the number.
Example:
i. 5 × 136, half of 136 is 68, add a zero for an answer of 680.
ii. 5 × 874, half of 874 is 437; add a zero for an answer of 4370.
MULTIPLYING 5 TIMES AN ODD NUMBER: subtract one from the number
Popularity: 13%
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