williamkruse080 williamkruse080
  • 24-04-2014
  • Mathematics
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You start with a number. Double it. Square the answer. You get 400. What number did you start with?

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MathG33k
MathG33k MathG33k
  • 24-04-2014
10x2 = 20
20^2 = 400
So the answer is 10
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