Mia and Tia will use 2 packages of mix to make 4 pitchers of lemonade.
At the end of the week the pitcher will be
filled with lemonade.
Step 1
Mia and Tia drank three quarters of a full pitcher on Monday.
pitcher +
pitcher =
pitcher
Each day of the week, they will drink the same quantity.
Step 2
In five days Mia and Tia will drink 5
pitcher, or 3
pitchers.
5
=
= 3 
Step 3
The least amount of lemonade they must prepare is 4 pitchers. (3 pitchers is not enough.)
Step 4
If
package produces 1 full pitcher, then 1 package produces 2 pitchers.
To make 4 pitchers of lemonade, they need 2 packages of lemonade mix.
Step 5
They will make 4 pitchers of lemonade, but drink 3
pitchers.
To find out how much lemonade will be left:
4 3 
At the end of the week,
pitcher of lemonade will be left.
These diagrams may help you to solve this Brain Teaser.