Here's how to solve the problem:
**1. Students not good in Science:**
* There are 42 students in total.
* 1/3 of them are not good in Science: (1/3) * 42 = 14 students
**2. Students good in Science:**
* Total students - students not good in Science = students good in Science
* 42 - 14 = 28 students
**Answer: There are 28 students that are good in Science.**