Question

A is directly proportional to B.
If A is 9, when B is 3, then A is _____, when B is 6.

Answer 1

If A is 9, when B is 3, then A is 18, when B is 6. Your double it

Answer 2

Since A is 9, when B is 3, we can notice that two numbers are different by x3
So to find A we must multiply B (6) by 3 to get a
6 x 3 = 18

A is 18, when B is 6