That depends on the size of the bricks you want to use, and what unit you've measured in-10 metres by 20 metres? 10 feet by 20 feet?
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between 1100 and 1200 bricks
46 bricks; add a few more for waste and cutting
you would need 12...
12x13/12=13
6 inches is half a foot so it takes four 6 by 6 inch bricks to make one square foot. 348 x 4 = 1392. So you'll need 1392 bricks.