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Anonymous
400 x 1 200 x 2
100 x 4
80 x 5
50 x 8
40 x 10
25 x 16
20 x 20
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400 x 19 = 7600
40
Let 4x = 400. x = 400/4 =100. Therefore 4 * 100 = 400
It is a square number because 20 times 20 = 400
One-and-a-half times 400