Riddle: A rubber ball is tossed off the top of a 90 foot building. Every time it bounces, it goes back up half way. How many bounces will the ball take before it stops?
Answer: The answer is infinite, in a gravity free world. But of course gravity will eventually stop it.
Riddle: If you toss a die and it comes up with the number one 9 times in a row, what is the probability that it will come up with one on the next throw?
Answer: One in six. A die has no memory of what it last showed.
If you toss a die and it comes up with the number one 9 times in a row, what is the probability that it will come up with one on the next throw? Riddle Meme.
Riddle: 'When Gwen is twice as old as Dean, Then I shall be just 17. But Gwendoline was 23 When Dean was twice as old as me.' Thats what Bill said. So tell us then, How old he was when Dean was ten?
Answer: Eight.
Riddle: What single-digit number should go in the box with the question?
6 5 9 2 7
1 4 3 5 ?
8 0 2 8 1
Answer: The missing number is 4.  Simply add the first and second rows together to get the third row value.
  65, 927
+ 14, 354
  80, 281
Riddle: Find four numbers, the sum of which is 45, so that if 2 is added to the first number, 2 is subtracted from the second number, the third number is multiplied by 2 and the fourth number is divided by 2, then the four numbers so produced are all the same. What are the four numbers?
Answer:  8 + 2 = 10 12 - 2 = 10   5 x 2 = 10 20 ÷ 2 = 1045
Find four numbers, the sum of which is 45, so that if 2 is added to the first number, 2 is subtracted from the second number, the third number is multiplied by 2 and the fourth number is divided by 2, then the four numbers so produced are all the same. What are the four numbers? Riddle Meme.
Riddle: What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1,000?
Answer: One hundred - work backwards and you will understand.
Riddle: How many times does the long hand of the clock pass the short hand between midnight one day and midnight the following day? As both hands are together at the starting time of midnight this does not count as a pass.
Answer: 21.
Riddle: If seven cats kill seven rats in 7 minutes, how many would be needed to kill one hundred rats in 50 minutes?
Answer: 14.
Riddle: How can you give someone $63 using six bills, without using any one dollar bills?
Answer: 1 - $50 bill, 1 - $5 bill , 4 - $2 bills
Riddle: A box of hardware contains nuts and bolts. The bolts account for 25 percent of the number of items in the box. What percentage are the bolts of the entire box?
Answer: 20 percent. For example, there are 10 bolts.  Since the number of bolts is 25 percent of the number of items, there must be 40 nuts. The total number of items = 10 bolts + 40 nuts = 50.  So, 10/50 = 1/5 = 20%.