if 360 is divided into 4 parts proportional to 5 , 7 , 4 , 8 then the smallest part is :  Pick one: A) 50 B) 60 C) 40 D) 18 E) 22

Rationale: given ratio = 5 : 7 : 4 : 8 , sum of ratio = 24 : . the smallest part = ( 360 * 4 / 24 ) = 60 answer : b
Answer: B