Question
Average 20 numbers is ‘x’. If the average of
first 12 numbers is 64.5 while average of last 5 numbers is 84.8 and 13th, 14th and 15th numbers are (3x - 49), (x + 52) and 183 respectively. Find the 14th number.Solution
According to question, => 20x = 64.5 × 12 + 84.8 × 5 + 3x – 49 + x + 52 + 183 => 16x = 1384 => x = 86.5 Therefore, 14th number = 86.5 + 52 = 138.5
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