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163,840,000,000 406 = 40 x 40 x 40 x 40 x 40 x 40 = 4,096,000,000.
Some multiples of 40 are: 2 x 40 = 80 3 x 40 = 120 4 x 40 = 160 5 x 40 = 200 6 x 40 = 240 7 x 40 = 280 8 x 40 = 320 9 x 40 = 360 10x 40 = 400
1 x 40 = 40 2 x 20 = 40 4 x 10 = 40 5 x 8 = 40
40/x
x + 3x = 40 4x = 40 x = 10.