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How can you decide if a graph is traversable?

Frosty Is Melting!

Frosty the Snowman is melting. Can you work out how much less snow he contains when he is at half his starting height?

Waste and Recycling

Can you use the given information to work out how much plastic a family recycles?

Who's Who?

Age 11 to 16
Challenge Level

Some clues might help you immediately.

If there are just two options / possibilities, try each in turn and see if one leads to a contradiction...

You may have to use some clues in combination with others.