SSC CGL Tier-1 previous year question
In a class, 70% of students passed in Maths and 50% passed in Science. If 35% of students passed in both subjects and 90 students failed in both subjects, find the total number of students in the class.
Asked in SSC CGL Tier-1: 2024 Sep 11 Shift 2 () · Quantitative Aptitude
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Correct answer: (A) 600
Passed in at least one subject = 70% + 50% − 35% = 85%. Failed in both = 100% − 85% = 15%. Given 15% of total = 90, so total = 90 / 0.15 = 600.
हिंदी में प्रश्न
एक कक्षा में 70% छात्र गणित में तथा 50% छात्र विज्ञान में उत्तीर्ण हुए। यदि 35% छात्र दोनों विषयों में उत्तीर्ण हुए और 90 छात्र दोनों विषयों में अनुत्तीर्ण हुए, तो कक्षा में कुल छात्रों की संख्या ज्ञात कीजिए।
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सही उत्तर: (A) 600
कम-से-कम एक विषय में उत्तीर्ण = 70% + 50% − 35% = 85%। दोनों में अनुत्तीर्ण = 100% − 85% = 15%। दिया गया है कि कुल का 15% = 90, अतः कुल छात्र = 90 / 0.15 = 600।
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