Question
A was travelling from point X to point Y. He increased
his speed by 16 km/h after every hour. He reached his destination in 18 hours. If his initial speed was 30 km/h, then what was his average speed in the whole journey?Solution
Total distance travelled by A = (18/2) × {2 × 30 + (18 – 1) × 16} = 9 × (60 + 272) = 2988 km Required average speed = 2988/18 = 166 km/h
16Â Â Â 48Â Â Â Â 120Â Â Â Â 240Â Â Â 360Â Â Â ?
23   27    54    ?       195    231
...130 114 106 102 100 ?
5, 11, 32, 65, ?, 389
7Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 26Â Â Â Â Â Â Â Â Â Â Â 63Â Â Â Â Â Â Â Â Â Â Â 126Â Â Â Â Â Â Â Â Â Â 215Â Â Â Â Â Â 342
...11, 9, 15, 41 ,157, 789
5 14 56 220 1125 6786
...12                          13                         30                     �...
80, 255, 624, ?, 2400, 4095
If   20       x      46      147       604        3045
Then, x% of 25 = ?
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