Find the missing term : 90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3

The answer is 150.

The sequence is a combination of two sequences: 90, 180, 12, 50, 100, 200, … and 3, 50, 4, 25, 2, 6, 30, …

The first sequence is generated by multiplying each term by 2 and then subtracting 30. The second sequence is generated by multiplying each term by 5 and then subtracting 1.

The missing term is the 10th term in the first sequence, which is 150.