Task: Question Answering
Input (English): Problem: a flagstaff 17.5 m high casts a shadow of length 40.25 m . the height of the building , which casts a shadow of length 28.75 m under similar conditions will be : 
Options: a ) 10 m , b ) 12.5 m , c ) 17.5 m , d ) 21.25 m , e ) none
Output (English): b