The average of 13 numbers is 60. The average of the first 7 of them is 57 and that of the last 7 is 61. Find the 8th number?

13 نمبروں کی اوسط 60 ہے۔ ان میں سے پہلے 7 کی اوسط 57 ہے اور آخری 7 کی اوسط 61 ہے۔ 8 واں نمبر تلاش کریں؟
Answer: 46
Explanation

Sum of all the 13 numbers = 13 * 60 = 780

Sum of the first 7 of them = 7 * 57 = 399

Sum of the last 7 of them = 7 * 61 = 427

So, the 8th number = 427 + 399 – 780 = 46

ND11-4-2023

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