"A, B and C can complete a work in 10, 12 and 15   days respectively. They started the
Channel: Doubtnut
Date: 05/07/2020

"A, B and C can complete a work in 10, 12 and 15
 
  days respectively. They started the work together. But A left the work 5 days
 
  before its completion. B also left the work 2 days after A left. In how many
 
  days was the work completed?
 `4`
 b. `15`
 c. `7`
 d. `8`"