Question 714715
They work together for 4 days
Add their rates of working
{{{ 1/8 + 1/16 = x/4 }}}
Multiply both sides by {{{ 16 }}}
{{{ 2 + 1 = 4x }}}
{{{ 4x = 3 }}}
{{{ x = 3/4 }}}
They complete 3/4 of the job, there
is 1/4 of the job left to do
( fraction of the job left ) / ( father's rate ) = time to finish
{{{ ( 3/4 ) / ( 1/8 ) = t }}}
{{{ t = 6 }}}
It takes the father 6 days to finish the job