Task: Question Answering
Input (English): Problem: the length of a rectangle is double its width . if the length is diminished by 5 cm and the width is increased by 5 cm then its area is increased by 75 cm square . what is the length of the rectangle ? 
Options: ['a ) 20', 'b ) 30', 'c ) 40', 'd ) 56', 'e ) 65']
Output (English): c