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- Question
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?
- 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
- 1. Puzzle : Sequence of numbers Sequence of numbers are 1, 11, 21, 1211, 111221. What will be the next one in the above sequence? Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. Riddle How can you add eight 8's to get the number 1,000? (only use addition) Discuss
- 6. Guess which number should be replaced by the "?" in the given series 0,10,1110,3110,132110,? Discuss
- 7. How many times can you subtract 10 from 100?
Options- A. 9 times
- B. 10 times
- C. 1 time
- D. 0 times Discuss
- 8. Puzzle : Blueberries and Cups Maria have some blueberries and some cups. If she put 9 blueberries into each cup she will have two cups left. If she put 6 blueberries into each cup she will have three blueberries left over. Discuss
- 9. If 9 = 63 8 = 48 7 = 35 Then 4 = ?
Options- A. 4
- B. 8
- C. 12
- D. 16 Discuss
- 10. In a certain city, 5% of all the persons in town have unlisted phone numbers. If you select 100 names at random from that city's phone directory, how many people selected will have unlisted phone numbers? Discuss
Math Puzzles problems
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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: 4
Explanation:
Let
=> 3x = 10
Given that
Therefore,
=> x = 10/3 = 4.
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: 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: The key to this math riddle is realizing that the one place must be zero 888 +88 +8 +8 +8 =1,000
Correct Answer: 1113122110 In given series 2nd number gives number of which digits present in the 1st number and so on continues for 3rd ,4th, Here 1st no has only one zero, so 2nd no is 10 and 2nd no has one 1 and one 0,so 3rd no is 1110, so like that 5th no has one 1,one 3,one 2,two 1's and one 0So the next no is 1113122110
Correct Answer: 1 time
Explanation:
How many times can you subtract 10 from 100, for this if we go through logically, it is only 1 time. For the first time if we subtract 10 from 100, then there will no 100 to subtract from.
Hence, it is only 1 time we can subtract 10 from 100.
Correct Answer: The number of blueberries is equal to number of cups multiplied by 4 minus one left That is : B = 9(C - 2) -> (1) Then the number of blueberries will be equal to the number of cups times three plus one left That is : B = 6C + 3 -> (2) Now substitute the 1st and 2nd equations: B = 9(C - 2) B = 6C + 3 C = 7, B = 45 Therefore Blueberries = 45 and cups = 7
Correct Answer: 8
Explanation:
Here given that 9 = 63, 8 = 48, 7=35, ...
The given question follows a pattern that
9 x (9 - 2) = 9 x 7 = 63
8 x (8 - 2) = 8 x 6 = 48
7 x (7 - 2) = 7 x 5 = 35
Similarly, 4 x (4 - 2) = 4 x 2 = 8.
Correct Answer: Zero You are selecting names from the list, so they are all listed
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