Answer:
?
Step-by-step explanation:
Answer:

Step-by-step explanation:
Area of Rectangle = Length x Breadth
=

Answer:
cups of pineapple juice .
Step-by-step explanation:
Equation of direct proportion between x and y:

As per given,
Let x = quantity of pineapple juice and y = quantity of orange juice.
,
, 
Put these values in an equation we get

Hence, he needs
cups of pineapple juice .