Order of Operations Practice Test

A bus starts with 45 passengers. At the first stop, 5 passengers get off. At the second stop, 3 groups of 4 passengers get on. How many passengers are on the bus now?

Maya thinks of a number. She subtracts 3 from it, then multiplies the result by 4. Finally, she adds 6. If the final answer is 30, what number did Maya think of?