There were 28 students inside a bus before stopping at an intersection. After stopping at an intersection, there were 58 students on the bus. What's 40% of the number of students who entered the bus at the intermediate stop? Let's think first. Chain of thought:
At the intermediate stop, 58 - 28 = 30 students entered the bus before it stopped at the intersection. 40% of the number of students who entered the bus at the intermediate stop is 40 / 100 * 30 = 12.
Therefore, the answer is 12.