Mr. P’s Parent Maths Problem of the Week

Last Week’s Problem:

You are given a 3-gallon jug and a 5-gallon jug. How do you use them to get 4 gallons of liquid?

Solution

Fill the 5-gallon jug. Pour from the 5-gallon jug into the 3-gallon jug until the 3-gallon jug is full. Now the 5-gallon jug has 2 gallons left. 

Empty the 3-gallon jug. Pour the 2 gallons from the 5-gallon jug into the 3-gallon jug. Fill the 5-gallon jug again. Pour into the 3-gallon jug until it is full; it can only take 1 gallon. 

Now the 5-gallon jug has 4 gallons left!

This Week’s Problem: Term 3 Number 7

The Games department used a specific method to get the middle number in the diagram: