i) A rectangular room of dimensions having 63m long. 52m wide and 4m height. Find
its total surface area,
) How many lead cubes of side 2cm can be made from a lead cube of side 8cm ?
m) Decrease Rs 2700 by 30%.
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Answer:
(i) Length of cuboid = 63 m
Breadth of cuboid = 52m
Height of cuboid = 4m
Surface area of cuboid
= 2( lb + bh + hl )
= 2 ( 63×52 ) + ( 52×4 ) + ( 4×63 )
= 2 × 3276 + 208 + 252
= 2 × 3736
= 7472 m²
(j) Side of a cube = 2cm
Volume of cube = 8³
Side of another cube = 8cm
Volume of cube = 512³
Number of cubes can be made
= 512/8
= 64 cubes can be made.
(m) 30% of 2700 = 2700 × 30/100
= 27 × 30
= 810 rupee
Decrease in 30% = 2700 - 810
= 1890 rupee
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