Question 1032871
"Paint the room" is one whole job.  Beth and then Beth & Aaron do their work to complete 1 job.  The rule can be stated RT=J to relate rate, time, amount of job.


{{{highlight_green((1/8)3+(1/8+1/x)(2.5)=1)}}}
Do you understand this equation?   Observe and consider the two expressions on the left and that their sum is 1 whole job.