Sequence puzzle: Can you guess the middle number?

Look at this series: 30, 12, 18, XX, 30. What should be the middle XX? If you notice that 12 is 2*6 and 18 is 2*9, then this rule seems to continue all the time. Then, the middle number should be 2* 15, which is 30! Did you guess right? Come on, let me know your answer in the comments!

Sequence law

The law of this series is: each number is half of the previous number and then multiplied by an integer. So the middle number should be 2* 15, which is 30.

Reasoning game

This series of puzzles is a good reasoning game, which can exercise our logical thinking and mathematical ability. Did you guess right?