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SSC CGL 2025 First Shift 📅 12 Sep, 2025

The average of 15 numbers is 80. The average of the first 6 numbers is 72. The average of the next 6 numbers is 25% more than the average of the first 6 numbers. The 13th number is 8 more than the 15th number, and the 14th number is 10 less than the 15th number. What is the average of the 13th and 14th numbers?

A
70.89
B
85
C
75.67
D
80.65
Result Summary
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SSC CGL
2025 • 12 Sep, 2025 • First Shift
The average of 15 numbers is 80. The average of the first 6 numbers is 72. The average of the next 6 numbers is 25% more than the average of the first 6 numbers. The 13th number is 8 more than the 15th number, and the 14th number is 10 less than the 15th number. What is the average of the 13th and 14th numbers?
Correct Answer
75.67
Total=1200. First 6 sum=432. Next 6 sum=540. Remaining=228. X+8 + X-10 + X = 228 => 3X=230 => X=76.67. Avg(13,14) = X-1 = 75.67....
Ref/Book : 12 Sep S1 2025_3.pdf
Ref. Subject Maths
Chapter -
Ref. Topic Average
Pg. No -
💡 Analysis & Explanation
Introduction ▼
Total=1200. First 6 sum=432. Next 6 sum=540. Remaining=228. X+8 + X-10 + X = 228 => 3X=230 => X=76.67. Avg(13,14) = X-1 = 75.67.
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