20 x 10 x 2 = 400
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20
10. Let us assume x is the number. x * (20/100) = 2 x * 20 = 200 x = 200/20 = 10 2 is 20% of 10.
1 x 20, 2 x 10, 4 x 5, 5 x 4, 10 x 2, 20 x 1 = 20
9x2 - 28x + 20 = 9x2 - 18x - 10x + 20 = 9x(x - 2) - 10(x - 2) = (9x - 10)*(x - 2)
X 2 + 8x -20 =0(x + 10)(x - 2)= 0x + 10 = 0 ............ x = -10andx - 2 = 0 ................. x = 2x = -10 or 2