A can do a work in 12days. When he had worked for 3days, B joinedhim. If they complete the work in 3more days, in how manydays can Balone finish the work?
Choose the correct option.
A) 2 days
B) 4 days
C) 5 days
D) 6 days
E) 9 days

Rationale: sax work done by afar 3 days : i j . . remzming war — 1 . work done by ( a + b ) for 1 day : . work done by a for 1 day 6 days d
Answer: D