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
20
10 is greater than square root 20 √20 = √(2 x 10) = √2 x √10 10 = √10 x √10 √10 > √2 → 10 > √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.
x % of 80 = 20 = x / 100 x 80 = 20 = 8 x / 10 = 20 = x = 20 x 10 / 8 = x = 25% (answer)
20 = 1 x 20, 2 x 10, 4 x 5, 5 x 4, 10 x 2, 20 x 1.
1 x 20, 2 x 10, 4 x 5, 5 x 4, 10 x 2, 20 x 1 = 20
The product is -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
1 x 20, 2 x 10, 4 x 5, 5 x 4, 10 x 2, 20 x 1
-20 = -4x - 6x -20 = -10x -20 / -10 = -10x / -10 2 = x x = 2
10% = 1/10 20% = 2/10, or 1/5 Actually it's like this: X = 10 - (.2 * 10) X = 10 - (2) X = 8