Problem: d and e are two points respectively on sides ab and ac of triangle abc such that de is parallel to bc . if the ratio of area of triangle ade to that of the trapezium decb is 144 : 25 and bc = 13 cm , then find the length of de . 
Options: a ) 12 , b ) 13 , c ) 14 , d ) 11 , e ) 15
c