## Wednesday, June 17, 2015

### 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

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.....)

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

7. 165135 is to peace as 1215225 is to