Mari adds 4 spoonfuls of honey to a pitcher of iced tea. each spoonful holds 5 ml of honey. how many ml of honey does mari add in all

What you can do for this case is to use the following rule of three to solve the problem:
 1spoonful ---> 5ml
 4spoonful ---> xml
 Clearing the value of x we have:
 x = (4/1) * (5)
 x = 20ml
 
 Mari adds 20ml of honey in all

Um what? rephrase that ?