Question
The volume of a cuboid whose length, breadth, and height
are in the ratio 5:3:2, respectively, is 3,000 cm³. Find the lateral surface area of the cuboid.Solution
ATQ, Let the length, breadth, and height of the cuboid be '5a' cm, '3a' cm, and '2a' cm, respectively. Volume of cuboid = length × breadth × height 
Lateral surface area of the cuboid = 2 × (length + breadth) × height = 2 × (5a + 3a) × 2a = 16a²=16×(10)² = 1,600 cm²
38    40    83    254    ?     5126
Find the wrong number in the given series.
3 1.5 1.5 ? 4.5 11.25
...If 7             16      x    90       171          292
Then, 2x 2 +  1 + x ...
98    219    75    244    ?    273
Find the maximum number of trees which can be planted, 25 meters apart, on the two sides of a straight road 2125 meters long
43 36 50 29 ? 22
...6Â Â Â Â Â Â Â Â Â Â 5Â Â Â Â Â Â Â Â Â Â 40Â Â Â Â Â Â Â Â Â Â Â 32Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 249Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 240
104   106   110   113   ?   126
6 2 8 ? 84 416
...75    196    52    221    ?    250
