Thread: 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.