Brain Teasers #1

1. You begin reading a book 240 pages long. If you read half of the remaining book each day how long would it take you to finish the book?

Answer: You will never finish it.

2. Add a single line to the equation in order to make it true.
    105 + 2 + 5 = 350

Answer:  Add a line to the second plus sign in order to make it into a four.
105 + 245 = 350
Or: Using the same small diagonal line and placing it on the equals sign also makes the statement true, since 105+2+5 does not equal 350.

3. What is the product of multiplying all the numbers from 20 to 0 in order? (20 x 19 x 18.....)

Answer: Zero

4. What number when multiplied against itself will result in a number which includes the numbers (1 - 9) in forward order, and then descending in order from the 9? (i.e., to get the number: 12,345,678,987,654,321)

Answer:  111,111,111 X 111,111,111 = 12,345,678,987,654,321
5. Which number should replace the question mark?

 

17	8	5	5
13	7	5	4
6	12	6	3
10	6	4	?

A. 4
B. 5
C. 6
D. 7

Answer: A, the sum of the first two numbers in a row is the product of the last two numbers in the row.
6. At the end of a banquet 10 people shake hands with each other. How many handshakes will there be in total?

A. 100
B. 20
C. 45
D. 50
E. 90

Answer: C, 9+8+7+6+5+4+3+2+1=45

7. 165135 is to peace as 1215225 is to

A. lead
B. love
C. loop
D. castle

Answer: love, letters are encoded with ASCII type code