A class of 30 students appeared in a test.

A class of 30 students appeared in a test. The average score of 12 students is 80, and that of the rest is 70. What is the average score of the class?
30 छात्रों की एक कक्षा एक परीक्षा में शामिल हुई 12 छात्रों का औसत प्राप्तांक 80 है, और शेष छात्रों का औसत प्राप्तांक 70 है। कक्षा का औसत प्राप्तांक क्या हैं?

87 77 74 67

Detailed Solution & Logic

Correct Answer:

74

Total of 12 students = $12 \times 80 = 960$
Total of remaining 18 students = $ 18 \times 70 = 1260$
Total score of class = 960 + 1260 = 2220
Average score of class= $ \dfrac{2220}{30} = 74$

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