In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Q: Problem: if 40 men take 15 days to to complete a job , in how many days can 25 men finish that work ? 
Options: a ) 24 , b ) 25 , c ) 26 , d ) 27 , e ) 28
A: 
a