Illustrate a Venn diagram based on the given problem below and answer the following questions.

Given: In a class of 50 students,
25 are good in Mathematics,
20 are good in English, and
8 are both good in Mathematics and English.

_____ 1. How many students are good in Mathematics only?
_____ 2. How many students are good in English only?
_____ 3. How many of them are not good in Mathematics?
______4. How many of them are not good in English?
______5. How many of them are not good in both Mathematics and English?