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Let the original member be x Total age of these members = 54.5x Total age of (x – 4) members = (54.5x – 140) years According to the question, 54.5x – 140 = (x – 4) × 57.5 ⇒ 54.5x – 140 = 57.5x – 230 ⇒ 57.5x – 54.5x = 230 – 140 ⇒ 3x = 90 x = 30
16 25 36 49 64 ?
5, 18, 39, 68, 105, ?
-1, 5, 23, 59, ?
58, 67, ?, 76, 40, 85
188 178 158 ? 88 38
Which of the following number will replace the question mark (?) and complete the given number series?
4, 5, 12, 39, 160, ?
418, 406, 430, 382, 478, ?, 670
12, 11, 20, 57, 224, 1015
216, 81, 297, 378, ?, 1035, 1728
8, 9, 125, ?, 1331, 169