A school has only four classes that contain 10, 20, 30 and 40 students respectively. The pass percentage of these classes are 20%, 30%, 60% and 100% respectively. Find the pass % of the entire school.

by

A. 70%
B. 66%
C. 55%
D. 60%

🧠 Explanation (Math):

Given: Classes sizes 10,20,30,40 with pass % 20%,30%,60%,100%
Step 1: Passed = 2, 6, 18, 40 ⇒ total = 66
Step 2: Total students = 100 ⇒ pass % = 66%
Final Answer: 66%