The average marks obtained by 150 candidates was 35. If the average marks of passed candidates was 39 and that of the failed candidate was 15, find the number of candidates who passed the examination :
150 विद्यार्थियों द्वारा प्राप्त औसत अंक 35 थे। यदि इनमें से उत्तीर्ण विद्यार्थियों का औसत प्राप्तांक 39 हो तथा अनुत्तीर्ण विद्यार्थियों का औसत प्राप्तांक 15 हो, तो परीक्षा में उत्तीर्ण होने वाले विद्यार्थियों की संख्या ज्ञात कीजिए :
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Correct answer: B. 125
Explanation
39p + 15(150 − p) = 35 × 150 → 24p = 3000 → p = 125.
39p + 15(150 − p) = 5250 → 24p = 3000 → p = 125।
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