twenty times
20 x 20 = 400
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400 million
You would need 20 pavers 20 times which is 20x20=400.
The answers are sqrt(400) = -20 or +20The answers are sqrt(400) = -20 or +20The answers are sqrt(400) = -20 or +20The answers are sqrt(400) = -20 or +20
It is a square number because 20 times 20 = 400
For example: 20*20 = 400 and there are many more