18/8 * 9/16 = 18*9/(8*16) = 9*9/(8*8) = 81/64 or 1.265625
16
No. 8 to 9 is proportional to 16 to 18, not 18 to 16.
16/18 = 8/9
((18 * 16) / 9) - 8 = 24.
That's the same as 8/9 x 18/9 = 144/81 = 16/9 or 1 and 7/9
9
2/3 x 9/16 = 3/8
8/9
Yes, 16/18 = 8/9
9 + 8 + 16 + 17 + 18 = 68
8/9 = 16/18
-2(x + 9) = -8 -2x - 18 = -8 -2x = 10 x = -5