Powered By Blogger

Tuesday, 23 December 2014

Page numbers of a book

A puzzle from Monday Edex issue (New Indian Express) of  9 june 2014-
The pages of a book are numbered 1 to n.When the page numbers were added by someone just for fun,one of the page numbers were added twice,resulting in an incorrect sum of 2014.Find the page number which was wrongly added twice..

Tuesday, 25 November 2014

Date of death-paradox

See the paradox below-
Both great writers Shakespeare and Cervantes died on the same date 23 April 1616.However they also died 10 days apart.How?
Here is the explanation-
Shakespeare died on 23 april 1616 according to Julian Calendar which was still used in England at the time whereas Cervantes died on 23 april 1616 according to the Gregarian calendar which was used in Madrid.The difference between the calendar accounts for the paradox.Spain had opted for Gregarian calendar as early as in 1582,while England waited till1752 to effect the change.

Thursday, 23 October 2014

Who won what medals-Logic puzzle

Students of a school are divided into 3 teams-A,B and C
Using the clues given below,work out the number of gold,silver and bronze medals that A,B and C-
won-
1)A won 1 gold medal more than B,but 3 silver medals less than B
2)C has the highest number of bronze medals(18),but least number of gold medals(7)
3)Each team won at least 6 medals each type
4)B won  2 bronze medals more than gold medals
5)The 3 teams won 38 bronze medals in total
6)B won 27 medals in total
7)C won twice as many silver medals as the number of gold medals that B won

Tuesday, 16 September 2014

A number sequence to be filled-Rejoinder

I had asked readers to find the next number in the sequence 10,9,60,90,70,66
I had also suggested to treat this as an alpha-numeric sequence .
The numbers given are the number of alphabets which are required for expressing the highest numbers with  3,4,5,6,7,and 8 alphabets.
You are thus required to find the highest number which needs 9 alphabets for expression.
No one has given a solution.
Obviously the highest number has to be below 100.
Let us first consider numbers from 90 to 99.
97,98 and 99 require more than 9 alphabets.Only the number 96 requires 9 alphabets and so this is our candidate.  

Friday, 15 August 2014

Trilemmas

The term trilemma is similar to the term dilemma.
It refers to 3 choices/statements available out of which only two can be seen as true or amenable to acceptance
There are many examples-I have shown 2 of them below-
1)Manufacturing processes-Choices available-Fast...Good....Cheap
2)Three statements regarding religious beliefs
a)If god is unable to prevent evil,then he is not very powerful
b)If god is not willing to prevent evil then he is not at all good
c)If god is both willing and able to prevent evil then why does it(evil) exist?


Thursday, 31 July 2014

Decimal fractions puzzle-Rejoinder

Though it is a very easy puzzle, no one has given a reply so far.
Let me explain the method.
For the 3 fractions x,y and z ,I had mentioned that x(1),y(1) and z(1) are the integer parts and x(2),y(2) and z(2) the decimal parts.
So you can see that x=x(1)+x(2).....y=y(1)+y(2)     and z=z(1)+z(2).
I had given 3 equations x+y(1)+z(2)=4.2
.                                  y+z(1)+x(2)=3.6 and
                                   z+(x(1)+y(2)=2.0
Adding all 3 together we get x+y+z+x(1)+y(1)+z(1)+x(2)+z(2)=9.8 or because x=x(1)+x(2) ..etc
we have 2(x+y+z)=9.8 or x+y+z=4.9
Deducting the first equation from this we will have x+y+z-x-y(1)-z(2)=4.9-4.2=0.7 which means
y(2)+z(1)=0.7...This further means that z(1)=0 and y(2)=0.7
Similarly deducting the 2nd and 3rd equations we will get x(1)=1 and z(2)=0.3 and y(1)=2 and x(2)=0.9
Thus the 3 fractions are 1.9,....2.7 ... 0.3.

Thursday, 24 July 2014

A number sequence to be filled

You are required to find the next number in the sequence 10,9,60,90,70,66
You will find it difficult to find the number if you tackle it as a mathematical issue
The actual way is to tackle it as an alphanumeric issue.
10 is the highest number which can be written in 3 alphabets
9 similarly the highest which can be written in 4 alphabets.
Likewise 60,90,70,66 -those which are highest as could be written in 5,6,7 and 8 alphabets.
Now go ahead and find the highest number which could be written in 9 alphabets.