Puzzles Questions

Q:

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?

Answer

  Zero. You are selecting names from the list, so they are all listed.

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Subject: Math Puzzles

6 6744
Q:

Which number multiplied by itself will give the output as 12345678987654321 ?

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).

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Subject: Math Puzzles

133 19165
Q:

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?

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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Subject: Math Puzzles

22 7973
Q:

Arrange four nines(9) and a one(1) and only one mathematical symbol to make it equal to 100 ?

Answer

199 - 99  = 100

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Subject: Math Puzzles

163 19931
Q:

In a Certain Country 1/2 of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10 ?

A) 4 B) 6
C) 8 D) 10
 
Answer & Explanation Answer: A) 4

Explanation:

Let 1310 = x 

=> 3x = 10

 

Given that 125=3

 

Therefore, 52x = 10 

 

=> x = 10/3 = 4.

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Filed Under: Math Puzzles
Exam Prep: CAT , Bank Exams , AIEEE
Job Role: Bank Clerk

19 8744
Q:

Replace each letter for a unique digit so that the equation is correct

Answer

(1+9+6+8+3) x (1+9+6+8+3) x (1+9+6+8+3) = 19683

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Subject: Math Puzzles Exam Prep: Bank Exams , AIEEE
Job Role: Bank Clerk

16 6344
Q:

Logical puzzle

You have 10 coins….arrange them in 4 straight lines such that each line contains 4 coins.

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27 4333
Q:

What mathematical symbol can be placed between 5 and 9, to get a number greater than 5 and smaller than 9?

Answer

decimal point [i.e, 5.9]

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Subject: Number Puzzles

48 7907