Puzzle 21

-

In this post, I have very easy puzzles - 3 of them. And I will give away the solutions too.

  1. Your parents have 6 sons and each son has one sister. How many people are there in the family?
  2. Which four digit no multiplied by itself gives the number in reverse?
  3.  If
  • 12X12 = 9,  
  • 23X23 is 16  , 
  • what is 34X34?



Solutions :

  1. 9
    1. There is one daughter and 6 sons. And father and mother.
  2.  2178
    1. 2178X4 = 8721
  3. 13
    • Add the digits of the product.
    • 12X12 = 144 ; 1+4+4 = 9
    • 23X23 = 529 ; 5+2+9 = 16
    • 34X34 = 1156; 1+1+5+6 = 13

 

Comments

Post a Comment

Popular posts from this blog

Puzzle 9 : The 4 coins problem

-
 Solution to puzzle 8: Maria is not counting Sundays. So she is not counting 1/7th of days of her age.  That is to say she is only counting 6/7th of her age. 6/7th of her age = 30 Her actual age = 30 X 7/6 = 210/6 = 35 years.  Puzzle 9 : The 4 coins problem  You’re creating a new coin system for your country. You must use only four coin values and you must be able to create the values 1 through 10 using one coin at a minimum and two coins maximum. What 4 coins do you choose, and can you think of a second set of 4 coins that achieves the same goal?
Read more

Puzzle 35 - Open sesame

-
I am writing a post after two months.  Here is a locked question ;) There is a number lock. You have to find the number to unlock it.  And here are the results of various number combinations. 682 - one digit is right and in the right position. 614 - one digit is right but in the wrong position. 206 - two digits are right but both are in the wrong positions. 738 - all digits are wrong. 380 - one digit is right but in the wrong place So what is the correct code to open the lock? Find the solution here
Read more

Puzzle 66 - solution

-
 The question was  What is wrong with this proof ? a=b multiply both the sides by a     --1 a2 = ab  add -b2 to both the side           --2 a2-b2 =ab-b2  factorizing                                --3 (a+b)(a-b) = b(a-b)  divide both the sides by (a-b)    ---4 a+b=b Substituting a with b,              ---5 2b = b Dividing both the sides by b    ---6 2 = 1   The problem is with step 4. When a is equal to b, a-b is zero. You can not divide numbers by zero because division is only defined for non-zero numbers.  
Read more