Task: Question Answering
Input (English): Problem: 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
Output (English): d