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Let the speed of the boy in still water be x kmph. Then, (x + 5) × 3 = (x – 5) × 8 => 3x + 15 = 8x - 40 => 5x = 55 => x = 11 kmph
3, 15, 35, 63, 99, 143
14, 16, 22, 46, 172, 886
97, 98, 107, 132, 181, 264
11 36 112 336 1011 3036
120, 136, 111, 147, 93, 162, 81
Find the wrong number in the given number series.
2, 3, 5, 7, 11, 13, 17, 20
120, 60, 80, 90, 180, 450
6, 24, 125, 720, 5040, 40320