9/21 = 3/7 = 0.42857 in decimal
9 a.M
3 and 1
A + 9 = 21 A = 21 - 9 A = 12
3:4 or 6:8
21 * 9 = 189
21-9 = 12
6x - 9 = 21 6x = 21 + 9 6x = 28 x = 28/6 Reduce to: x = 14/3
3
LCD(9, 21) = 63
9 multiplied by 21 is 189.
21
-12 = x+9 x+9 -9 = -12 -9 x = -21