Answer:
3 : 6
Step-by-step explanation:
in all the ratios, the first number is multiplied by 2 to get the second number
ex. 9 × 8 = 18 and 15 × 2 = 30
so you can use any two numbers that follow this pattern
my answer : 3 × 2 = 6 so 3 : 6 works in this pattern
