A new apartment building containing 100 apartments was just completed. A painter was hired to paint the numbers 1 to 100 on the doors. How many times will the painter have to paint the number 9?
A new apartment building containing 100 apartments was just completed. A painter was hired to paint the numbers 1 to 100 on the doors. How many times will the painter have to paint the number 9?
[...] answer to yesterday’s Thursday Thinker of how many nines would be painted on the doors is [...]