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Australian AMC 2018 - Upper Primary Question 30

AMC AUSTRALIA · Australian AMC 2018 - Upper Primary

Question 30

The answer to a cross-number puzzle clue is a whole number (not a word).
A fragment of such a puzzle is shown. Some clues are:

Across
1\. Square of 27-down.
6\. Half of 1-across.

Down
1\. Twice 2-down.
2\. A multiple of 9.

What is 2-down?

Question illustration