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Help with this math problem!!!


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It is from CWP level 5 and I am stumped as to how to visualize it. It is also in the challenging problems set.


Mark has a rectangular cardboard of length 68 cm and perimeter 230 cm. He cuts a part of the cardboard to make a cubical box 12 cm long. What is the area of the cardboard left?


I can find the width of the original piece of cardboard. I know the cubical box is 12 x 12 x 12 and I know that once I cut out the part to make the cube I use the remaining dimensions to find the area left.


BUT I cannot figure out how to cut out the piece for the cube!!!



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