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The latest instalment of our Backs v Forwards trivia contest pitted Nene Macdonald with Ryan James. Who would you back?

The subject ... Australiana.

The questions:

1. Which of this a mix of inventions wasn't an Australian innovation? 

Chiko roll, lawn sprinkler, plastic bank notes, dual flush toilet or the wine cask.

2. What was Sir Donald Bradman's Test batting average.

3. What is the highest grossing Australian movie of all time?