If you can buy 1 for $1, 14 for $2, and 145 for $3, what are you buying?
Answer: House numbers
Solution:
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In a house, there lives a family of 4. There is a father, a mother, an older sister, and a younger sister. One day, the father catches a disease. A week later, Death comes to take the father’s soul. The mother begs for 5 more years with her husband, and Death agrees. 5 years later, Death comes back. The older sister begs for 3 more years with her father, and Death agrees. 3 years later, Death comes back. The father, mother, and older sister turn to the younger sister for help, and she is holding a candle with a flame on the end of the wick. The younger sister says, “I have a deal to make, Death. My father will live until this candle burns out.” And Death agrees. However, Death never returns. Why not?
Answer: The younger sister blew out the candle, so it didn't technically burn out. Then she threw away the candle so the family wouldn't mistakenly light it.
Solution:
With three eyes and a black as night, I frequently knock down ten men with a single strike! What am I?
Answer: A Bowling ball.
Solution:
When the celebrated German mathematician Karl Friedrich Gauss (1777-1855) was nine he was asked to add all the integers from 1 through 100. He quickly added 1 to 100, 2 to 99, and so on for 50 pairs of numbers each adding to 101. Answer: 50 X 101=5,050. What is the sum of all the digits in integers from 1 through 1,000,000,000? (That’s all the digits in all the numbers, not all the numbers themselves.)
Answer: The numbers can be grouped by pairs: 999,999,999 and 0; 999,999,998 and 1' 999,999,997 and 2; and so on.... There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then: (500,000,000 X 81) + 1= 40,500,000,001.
Solution:
Show Answer
The numbers can be grouped by pairs:
999,999,999 and 0;
999,999,998 and 1′
999,999,997 and 2;
and so on….
There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then:
(500,000,000 X 81) + 1= 40,500,000,001.
Show Answer
The numbers can be grouped by pairs:
999,999,999 and 0;
999,999,998 and 1′
999,999,997 and 2;
and so on….
There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then:
(500,000,000 X 81) + 1= 40,500,000,001.
999,999,999 and 0;
999,999,998 and 1′
999,999,997 and 2;
and so on….
There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then:
(500,000,000 X 81) + 1= 40,500,000,001.
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