Task: Question Answering
Input (English): Problem: an ore contains 25 % of an alloy that has 90 % iron . other than this , in remaining 75 % of the ore , there is no iron . how many kgs of the ore are needed to obtain 60 kg . of pure iron . ? 
Options: a ) 266.69 , b ) 266.67 , c ) 266.66 , d ) 263.66 , e ) 266.61
Output (English): d