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
 answer:
 Mari adds 20ml of honey in all