12 × ratio = -18 → ratio = -18/12 = -3/2 = -1.5 Checking: -18 × ratio = -18 × -3/2 = 27 as required The common ratio is -3/2 (or -1.5)
12 : 12 : 6 30 = (12x2) + (6x1) so ratio will be 12 : 12 : 6 = 2 : 2 : 1
1 and 2
12:1
2 to 3.
2 to 3.
2 to 3.
It is 2 to 1.
3 to 2
2 to 1
2/3
The ratio of 18 to 12 (18:12) = 3:2 = 1.5 people per chair