Average 20 numbers is ‘x’. If the average of first 12 numbers is 65.5 while average of last 5 numbers is 72.4 and 13th, 14th and 15th numbers are (2x - 40), (x + 52) and 183 respectively. Find the 14th number.
According to question, => 20x = 65.5 × 12 + 72.4 × 5 + 2x – 40 + x + 52 + 183 => 17x = 1343 => x = 79 Therefore, 14th number = 79 + 52 = 131
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