Question 880397

Re TY
{{{  highlight_green(5/12) }}} is the amount of work left to do.
After 3days
3/9 + 3/12 = 1/3 + 1/4 = <u> 7/12 of work done</u>
 x/9 + x/18 = {{{  highlight_green(5/12) }}}   |Multiplying thru by 72 so as all denominators = 1
 8x + 4x = 30
      12x = 30
        x = 30/12 = 2 1/2 days for A & C to finish