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- Question
Riddle How can you add eight 8's to get the number 1,000? (only use addition)
- Correct Answer
- The key to this math riddle is realizing that the one place must be zero 888 +88 +8 +8 +8 =1,000
- 1. Puzzle : Identical Balls There are 8 identical balls. In that one of the ball is overweight. There are only two chances to weigh in the weighing machine. How to find the overweight ball? Discuss
- 2. A cuboid shaped wooden block has 6 cm length, 4 cm breadth and 1 cm height. Two faces measuring 4 cm x 1 cm are coloured in black. Two faces measuring 6 cm x 1 cm are coloured in red. Two faces measuring 6 cm x 4 cm are coloured in green. The block is divided into 6 equal cubes of side 1 cm (from 6 cm side), 4 equal cubes of side 1 cm(from 4 cm side). How many cubes will have green colour on two sides and rest of the four sides having no colour ?
Options- A. 8
- B. 24
- C. 16
- D. 4 Discuss
- 3. Solve the following puzzle You are going to visit your grandmother on Mother's day. You want to give her two cakes. However, to get to her house you must cross seven bridges. At each bridge is a troll who demands ½ of all of your cakes as the price to pass. However, this troll, being a nice troll, feels bad and gives you back 1 of the cakes that he took. The puzzle to solve: How many cakes must you leave with to be able to give your grandmother 2 cakes Discuss
- 4. How many letters of the word FAINTS, will their order in the word and that when the letters are arranged in the alphabetical order, remain the same?
Options- A. Two
- B. One
- C. Three
- D. Nil Discuss
- 5. Which number multiplied by itself will give the output as 12345678987654321 ? Discuss
- 6. A number of cats got together and decided to kill between them 999919 rats. Every cat killed an equal number of rats. Each cat killed more rats than there were cats. How many rats do you think that each cat killed ?
Options- A. 1009
- B. 991
- C. 2000
- D. 1000 Discuss
- 7. Puzzle : Bridge Crossing Jim, Jeanne, Louis and Anne wants to cross the bridge at night. They have only one torch light with them. Only two can cross the bridge at a time. They need torch light to cross the bridge. Each of them walks at a different speed. Jim needs 1 minute, Jeanne needs 2 minutes, Louis needs 5 minutes and Anne needs 10 minutes. A pair must walk together at the rate of the slower person. How these people can cross the bridge within 17 minutes? Discuss
- 8. In a Certain Country 1/2 of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10 ?
Options- A. 4
- B. 6
- C. 8
- D. 10 Discuss
- 9. Puzzle : Sequence of numbers Sequence of numbers are 1, 11, 21, 1211, 111221. What will be the next one in the above sequence? Discuss
- 10. What 5 - digit number has the following features : If we put the numeral 1 at the beginning, we get a number three times smaller than if we put the numeral 1 at the end of the number? Discuss
Math Puzzles problems
Search Results
Correct Answer: First weigh 3 against 3 balls If the ball contains among these six balls, then take the three balls which weighed over, and weigh the ball 1 against 1 If the balls are not equal and any one of the ball weighs more, that is the overweight ball, else the one among the three which is not weighed is the ball If the 3 against 3 balls were equal, then weigh the 2 balls, then the overweight ball will be found
Correct Answer: 8
Correct Answer: Do the math and you will see that this puzzle is based on the fact taht (2)=1 and 1+1=2
Correct Answer: Two
Correct Answer: 11 * 11 = 121 111 * 111 = 12321 what we observe is that the square of the number follows a pattern: 2 1's gives 121 3 1's gives 12321 so to get 12345678987654321 we need to get square of 9 1's(111,111,111)
Correct Answer: 1009
Explanation:
Given total number of rats = 999919
999919 = 1000000 - 81 =
= (1000+9)(1000-9) = 1009 x 991.
Since there were more rats than there were cats, 991 cats killed 1009 rats each.
Correct Answer: First Jim and Jeanne walks across the bridge, it takes 2 minutes Jim walks back with the torch light, which takes 1 minute Then Louis and Anne walk on the bridge, which takes 10 minutes Jeanne comes back with the torch light, it takes 2 minutes Finally Jim and Jeanne walks across the bridge, which takes 2 minutes Total = 2 + 1 + 10 + 2 + 2 = 17 minutes
Correct Answer: 4
Explanation:
Let
=> 3x = 10
Given that
Therefore,
=> x = 10/3 = 4.
Correct Answer: It is a strange sequence Each number describes the resemblance of the previous one, except the first one 11 describes the previous '1' which contains one '1' 21 describes the previous '11' which contains two '1' 1211 describes the previous '21' which contains one '2' and one '1' 111221 describes the previous '1211' which contains one '1', one '2' and two '1' So the next sequence will be 312211, that is the previous '111221' contains three '1', two '2' and one '1'
Correct Answer: Let the 5 digit number be represented by abcde Then the 6 digit number, 1abcde x 3 = abcde1 (another 6 digit number) Now let Y = abcde Then (100000 + Y) x 3 = (Y x 10) + 1 300000 + 3Y = 10Y + 1 7Y = 299999 Y = 299999 ÷ 7 = 42857
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