1.

1). 6182). 6603). 7924). 814

Answer»

The ratio of length and breadth of a cuboid is 5 : 4. The ratio of breadth and height of this cuboid is 3 : 2.

LCM of 4 and 3 is 12. So, ratio of length, breadth and height will be 15 : 12 : 8.

Let length, breadth and height be 15T, 12T and 8T, respectively.

⇒ 15T × 12T × 8T = 1440

⇒ cube of T = 1

⇒ T = 1

So, length, breadth and height are 15 cm, 12 cm and 8 cm, respectively.

∴ Total surface AREA = 2(15× 12 + 12 × 8 + 8 × 15) = 792 SQUARE cm



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