Matt and Peter can do together a piece of work in 20 days. After they have worked together for 12 days peter stops and Peter completes the remaining work in 10 days. In how many days Matt complete the work separately. Options.
A) 28 B) 27 C) 26 D) 25 E) 29

Rationale: together they complete the job in 20 days means they complete 12 / 20 of the job after 12 days . peter completes the remaining ( 8 / 20 ) of the job in 10 days which means that the whole job ( 1 ) can be completed in x days . < = > 8 / 20 - > 10 < = > x = 10 / ( 8 / 20 ) = 25 d
Answer: D