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20 riddles to test your math, iq and thinking skills
1. What is the value of x If 1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/8, 8/9, 9/10 then x/1000?
2. If 4 and 2= 26, 8 and 1 = 79 and 6 and 5 = 111. Then, what is 7and3? 3. What 3 positive numbers give the same result when multiplied and added together? 4. What number do you get when you multiply all of the numbers on a telephone's number pad? 5. Here is a light switch. Note the order of the positions. If the light is now at medium and it is switched 3922 times what will be the position of the switch? 6. Can you arrange four nines to make it equal to 100? 7 Divide 110 into two parts so that one will be 150 percent of the other. What are the 2 numbers? 8. If 1/2 of 5 is 3, then what is 1/3 of 10? 9. 100 students entered college. 55 of them chose music. 44 of them chose sports. 20 of them chose both. How many of them chose neither music nor sports? 10. Four friends are going to a concert. When they arrive, there are only five seats together left in the theater. The manager will let all four friends in for free if one of them can tell her how many different seating arrangements are possible for four people with five empty seats. All four are let in free. Could you have given the correct answer? 11. The number of bacteria in a largely sealed jar doubles every minute. The bacteria will take an hour to fill the jar. When will the jar be half full? 12. At six o’clock the wall clock struck 6 times. Checking with my watch, I noticed that the time between the first and last strokes was 30 seconds. How long will the clock take to strike 12 at midnight? 13. There are several books on a bookshelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf? 14. John has been hired to paint the numbers 1 through 100 on 100 apartments. How many times with he have to paint 8? 15. You have two books. One of them is upsidedown and the other is rotated so the top of the book is facing you. What is the sum of the first page in each book? 16. There is a certain club which is for men only. There are 600 men who belong to this club and 5% of these men wear one earring. Of the other 95% membership, half wear two earrings and the other half wear none. How many earrings are being worn in this club? 17. Does a pound of gold or a pound of feathers weight more? 18. There is a chain nailed to the wall. The chain is 10 feet long and the center of the chain dips down 5 feet from where each side of the chain is nailed to the wall. How far are the 2 ends of chain from each other? 19. Little Johnny is walking home. He has $300 he has to bring home to his mom. While he is walking a man stops him and gives him a chance to double his money. The man says "I'll give you $600 if you can roll 1 die and get a 4 or above, you can roll 2 dice and get a 5 or 6 on at least one of them, or you can roll 3 dice and get a 6 on at least on die. If you don't I get your $300." What does Johnny do to have the best chance of getting home with the money? 20. If you have 6 women and 2 friends, how many women do each of your friends get? 
Tags 
math, riddles, thinking skills 
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