Task: Question Answering
Input (English): Problem: the perimeter of an equilateral triangle is 60 . if one of the sides of the equilateral triangle is the side of an isosceles triangle of perimeter 65 , then how long is the base of isosceles triangle ? 
Options: ['a ) 10', 'b ) 15', 'c ) 20', 'd ) 25', 'e ) 30']
Output (English): d