DSSSB TGT CS Mock 02 – Question 051

Question:

The average of 11 numbers is 50. If the average of the first 6 numbers is 49 and that of the last 6 numbers is 52, find the sixth number.

11 संख्याओं का औसत 50 है। यदि पहली 6 संख्याओं का औसत 49 है और अंतिम 6 संख्याओं का औसत 52 है, तो छठी संख्या ज्ञात कीजिए।

Options:

  • 56
  • 54
  • 58
  • 52
  • 56
  • 54
  • 58
  • 52

Correct Answer: a)

Explanation:

Total sum of 11 numbers = \(11 \times 50 = 550\).
Sum of first 6 numbers = \(6 \times 49 = 294\).
Sum of last 6 numbers = \(6 \times 52 = 312\).
The 6th number is counted in both groups.
Sixth number = \((294 + 312) – 550 = 606 – 550 = \textbf{56}\) (Option a).

11 संख्याओं का कुल योग = \(11 \times 50 = 550\).
प्रथम 6 का योग = \(6 \times 49 = 294\), अंतिम 6 का योग = \(6 \times 52 = 312\).
छठी संख्या = \((294 + 312) – 550 = 606 – 550 = \textbf{56}\) (विकल्प a)।

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