Students of three different classes appeared in common examination. Pass average of 10 students of first class was 70%, pass average of 15 students of second class was 60% and pass average of 25 students of third class was 80% then what will be the pass average of all students of three classes?

• ক 0.75
• খ 0.74
• গ 0.72 ✅ সঠিক উত্তর
• ঘ 0.69