A laboratory needs flasks, test tubes, and safety gear to carry out its experiments. They were given a $325 budget for the month. They bought $150 worth of flasks, spent two-thirds of that amount on test tubes, and used half of the test tube cost on safety gear. How many dollars of their budget remained? Let's think first. Chain of thought:
The laboratory spent 2 / 3 * 150 = 300 / 3 = $100 on test tubes. They spent a further 100 / 2 = $50 on safety gear. In all, they spent 150 + 100 + 50 = $300. Thus, 325 - 300 = $25 of the laboratory's budget remained.
Therefore, the answer is 25.