1000 Buildings And Number Of Zeros Puzzles

1,397.5K Views
Answered

Fry Link street has 1000 buildings.
A sign board maker is contracted to number the houses from 1 to 1000.

How many zeroes will he need?

 

ZERO_puzzle

 

Share
Add Comment

  • 2 Answer(s)
    Best answer
    Answer – 192

    EXPLANATION-

    Partition 1000 buildings into groups of 100.
    Group I – (1..100),
    Group II – (101..200),
    …………………………….
    Group X – (901..1000)

    For group I, sign-maker will need 11 zeroes.
    For group 2nd to 9th, he will require 20 zeroes each.
    And for the 10th group, he will require 21 zeroes.

     The total numbers of zeroes required are
    = 11 + (8*20) + 21
    = 11 + 160 + 21
    = 192

    Hence, 192 zeros will be required.

    Detective Expert Answered on 15th October 2015.
    Add Comment

    none!!
    He won’t be making any signboards saying “0”.
    All signboards will have a natural number.

    GeNiUs Genius Answered on 19th October 2015.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.
  • More puzzles to try-