Postman problem.

A postman delivers the mail in the small village Ten houses. This village has only one street with exactly ten houses, numbered from 1 up to and including 10.

In a certain week, The postman did not deliver any mail at two houses in the village; at the other houses he delivered mail three times each. Each working day he delivered mail at exactly four houses.

The sums of the house numbers where he delivered mail were:
on Monday: 18
on Tuesday: 12
on Wednesday: 23
on Thursday: 19
on Friday: 32
op Saturday: 25
on Sunday: he never works

Which two houses didn't get any mail that week?

This question contains several answers...

Answers are (2,10) (3,9) (4,6) (5,7)

Explanation...

total number of post of the week...18+12+23+19+32+25 = 129.

He delivered three time per house...so divide the total post by threee..

so 129/3= 43.

If he delivered all the house then the total is: 1+2+3+4+5+6+7+8+9+10=55

So he missed the house numbers total is: 55-43=12.

Any combination of 12 will comes to an answer...That is i mentioned above...

-suresh

Suresh,

This problem has only one answer:)

James,

What about the above answers...?

Anything wrong with the answers...it is satisfied all of your condition mentioned in that question..

yep. you can sort out three of ur 4 answers...proceed further with ur answers.