# A, B complete a work in 25, 20 days respectively. after working together for 5 days A left. B complete the work in

$\par&space;(A+B)'s&space;5&space;days&space;work&space;=$  $5\left&space;[\frac{1}{25}+\frac{1}{20}\right]$ $=$  $5&space;\left&space;[\frac{4+5}{100}\right]$ $=$  $5&space;\left&space;[&space;\frac{9}{100}\right]$ $=$  $\frac{9}{20}$

$\par&space;Remaining&space;work&space;=$  $1&space;-&space;\frac{9}{20}&space;=&space;\frac{11}{20}$

$\par&space;B&space;can&space;complete$ $\frac{11}{20}$  $\par&space;work&space;=$  $\frac{11}{20}&space;\times&space;20&space;=&space;11s$