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Let length = 7, breadth = 5 & Height of room = 2 So original total area of four walls = 2(7 `xx` 2 + 5 `xx` 2) = 2(14 + 10) = 2 `xx` 24 = 48 Then new length = 14, new breadth = 2.5 and new height = 1 So new total area of four walls = 2(14 `xx` 1 + 2.5 `xx` 1) = 2(14 + 2.5) = 2 `xx` 16.5 = 33 ; Hence decrease in total area of four walls = (48 - 33)/48 `xx` 100 = 31.25%
3, 10, 29, 66, ?
124, 128, ?, 135, 110, 146
2 10 40 120 ? 240
632, 625, 611, 590, 562, ?
9, 20, 63, ?, 1285, 7716
321, 240, ?, 105, 51, 6
6, 7, 15, 46, 185, ?
7, 176, ?, 378, 427, 452
...1221, 1100, 1000, 919, ?
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