Section A has 30 students with an average score of 62, and Section B has 20 students with an average score of 72. What is the average score of all 50 students?

Explanation

1. 01

   Total of Section A = $30 \times 62 = 1{,}860$; total of Section B = $20 \times 72 = 1{,}440$.

2. 02

   Combined total = 3,300 for 50 students.

3. 03

   Average = $\frac{3300}{50} = 66$.