Question
Average 20 numbers is ‘x’. If the average of first
12 numbers is 64.5 while average of last 5 numbers is 86.6 and 13th, 14th and 15th numbers are (2x - 42), (x + 50) and 162 respectively. Find the 14th number.Solution
According to question, => 20x = 64.5 × 12 + 86.6 × 5 + 2x – 42 + x + 50 + 162 => 17x = 1377 => x = 81 Therefore, 14th number = 81 + 50 = 131
8, ?, 29, 57, 113, 225
What will come in place of the question mark (?) in the following series?
15, 26, 39, 56, ?, 98
321, 240, ?, 105, 51, 6
In each of the following number series, one term is missing. Find the missing term.
7, 14, 28, 56, 112, ?
9    14    38    129    ?   2705   16260
...What will come in place of the question mark (?) in the following series?
11, 18, 32, 60, ?, 228What will come in place of the question mark (?) in the following series?
7, 84, 69, 828, 813, ?
What should come in place of (?) question mark in the given number series.
3, 8, 18, 38, 78, ?
What will come in place of the question mark (?) in the following series?
17, 21, 30, 46, ?, 107
97, 106, ?, 195, 411, 460
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