SSC GD Constable previous year question
The average of thirteen numbers is 57. The average of the first three numbers is 48, and the average of the next seven numbers is 58. The 11th number is double the 12th number, and the 12th number is 3 less than the 13th number. Find the average of the 11th and 13th numbers.
Asked in SSC GD Constable 2025: 07 Feb 2025 Shift 1 (Morning) · Quantitative Aptitude
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Correct answer: (C) 72
Total sum = 57×13=741. First 3 sum=144, next 7 sum=406. Remaining (11th+12th+13th)=191. Let 12th=x, 13th=x+3, 11th=2x → 4x+3=191 → x=47. So 11th=94, 13th=50; average=(94+50)/2=72.
हिंदी में प्रश्न
तेरह संख्याओं का औसत 57 है। प्रथम तीन संख्याओं का औसत 48 है, और अगली सात संख्याओं का औसत 58 है। 11वीं संख्या, 12वीं संख्या की दोगुनी है और 12वीं संख्या, 13वीं संख्या से 3 कम है। 11वीं और 13वीं संख्याओं का औसत कितना है?
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सही उत्तर: (C) 72
कुल योग = 57×13=741। पहली 3 का योग=144, अगली 7 का योग=406। शेष (11वीं+12वीं+13वीं)=191। मान लें 12वीं=x, 13वीं=x+3, 11वीं=2x → 4x+3=191 → x=47। अतः 11वीं=94, 13वीं=50; औसत=(94+50)/2=72।
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