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 70 , then how long is the base of isosceles triangle ? 
Options: a ) 15 , b ) 20 , c ) 25 , d ) 30 , e ) 35
Output (English): d