A man completes of a job in 10 days. At this rate, how many more days will it takes him to finish the job?
Pick
A) 6  B) 12  C) 7  D) 15  E) 5

Rationale: work done = 5 / 8 balance work = ( 1 - 5 / 8 ) = 3 / 8 let the required number of days be x . then , ( 5 / 8 ) : ( 3 / 8 ) = : : 10 : x ( 5 / 8 ) * x = ( 3 / 8 ) * 10 x = ( 3 / 8 ) * 10 * ( 8 / 5 ) x = 6 . answer is a .
Answer: A